Question: how fetus develops week by week

Pregnancy Week By Week- Fetal Development Week 1 To 40 In Mother’s Womb | Gymbuddy Now Pregnancy Week By Week- Fetal Development Week 1 To 40 In Mother’s Womb
Pregnancy Week By Week- Fetal Development Week 1 To 40 In Mother’s Womb
1. Your baby is like a cluster of cells at the time of conception.
2. By the second month the fetus develops to a size of kidney bean, keeps moving and has webbed fingers.
3. By the time you are in your seventh month, your baby is 40 cm that is 15 inches and the baby can open and close eyes and can see around itself.
4. Watch the video to find week after week development of your baby in your womb
 Pregnancy Week By Week- Fetal Development Week 1 To 40 In Mother’s Womb | Gymbuddy Now
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Pregnancy Week By Week- Fetal Development Week 1 To 40 In Mother’s Womb
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August 24, 2017
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Pregnancy is that special moment in a woman’s life where in she literally takes a new birth. During the 9 months of pregnancy a woman’s body goes through several changes as the fetus grows week by week. When your baby gets formed in your womb, it is a cluster of cells which develop each week and then forms face, legs, arms, heartbeat. As the baby grows it starts kicking you. Scroll over as we bring a video that shows how your baby develops each week during pregnancy before your little wonder enters your world: 1. Your baby is like a cluster of cells at the time of conception. 2. By the second month the fetus develops to a size of kidney bean, keeps moving and has webbed fingers. 3.

Pregnancy Week By Week- Fetal Development Week 1 To 40 In Mother’s Womb | Gymbuddy Now

Pregnancy Week By Week- Fetal Development Week 1 To 40 In Mother’s Womb
Pregnancy Week By Week- Fetal Development Week 1 To 40 In Mother’s Womb
1. Your baby is like a cluster of cells at the time of conception.
2. By the second month the fetus develops to a size of kidney bean, keeps moving and has webbed fingers.
3. By the time you are in your seventh month, your baby is 40 cm that is 15 inches and the baby can open and close eyes and can see around itself.
4. Watch the video to find week after week development of your baby in your womb

Pregnancy Week By Week- Fetal Development Week 1 To 40 In Mother’s Womb | Gymbuddy Now
Hangout
Pregnancy Week By Week- Fetal Development Week 1 To 40 In Mother’s Womb
By
Sandra
-
August 24, 2017
0
3515
ad
Pregnancy is that special moment in a woman’s life where in she literally takes a new birth. During the 9 months of pregnancy a woman’s body goes through several changes as the fetus grows week by week. When your baby gets formed in your womb, it is a cluster of cells which develop each week and then forms face, legs, arms, heartbeat. As the baby grows it starts kicking you. Scroll over as we bring a video that shows how your baby develops each week during pregnancy before your little wonder enters your world: 1. Your baby is like a cluster of cells at the time of conception. 2. By the second month the fetus develops to a size of kidney bean, keeps moving and has webbed fingers. 3.

What Is the Role of Mitosis in Fetal Development and Growth What Is the Role of Mitosis in Fetal Development
What Is the Role of Mitosis in Fetal Development
Submitted by N on October 26, 2010 at 11:32
Pregnancy And Baby Care Questions
 So by continuous mitosis, these cells differentiate into various tissues like the nervous tissue and muscle tissue. These tissues differentiate into organs like the brain, heart, limbs, and spinal cord. Fetal development week by week includes differentiation of cells into tissues and finally into fully functional organs, giving rise to a multicellular human being. By the eighth week, i.e., when the fetal stage is reached, the baby’s brain development is underway, his/her heart starts beating, and limb buds are visible. During the ninth– twelfth weeks the red blood cells are formed, genitals appear, the baby’s face is well formed, and tooth buds for baby teeth appear. In the thirteenth– fourteenth weeks, his/her skin is almost visible, and the baby starts making active movements. In the 17–25 weeks period, the mother can feel the baby’s movements. The baby has the ability to hear. Eyebrows, eyelashes, nails, and air sacs in lungs are all fully developed. The twenty-sixth to thirty-fourth week period shows rapid brain development;

What Is the Role of Mitosis in Fetal Development and Growth

What Is the Role of Mitosis in Fetal Development
What Is the Role of Mitosis in Fetal Development
Submitted by N on October 26, 2010 at 11:32
Pregnancy And Baby Care Questions

So by continuous mitosis, these cells differentiate into various tissues like the nervous tissue and muscle tissue. These tissues differentiate into organs like the brain, heart, limbs, and spinal cord. Fetal development week by week includes differentiation of cells into tissues and finally into fully functional organs, giving rise to a multicellular human being. By the eighth week, i.e., when the fetal stage is reached, the baby’s brain development is underway, his/her heart starts beating, and limb buds are visible. During the ninth– twelfth weeks the red blood cells are formed, genitals appear, the baby’s face is well formed, and tooth buds for baby teeth appear. In the thirteenth– fourteenth weeks, his/her skin is almost visible, and the baby starts making active movements. In the 17–25 weeks period, the mother can feel the baby’s movements. The baby has the ability to hear. Eyebrows, eyelashes, nails, and air sacs in lungs are all fully developed. The twenty-sixth to thirty-fourth week period shows rapid brain development;

Movement, Position & Growth of Fetus Week By Week in Pregnancy Growth of Fetus Week By Week in Pregnancy
Growth of Fetus Week By Week in Pregnancy
Pregnancy And Baby Care Questions
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The fifth week of pregnancy is when your baby's heart, spinal cord, brain and other organs start to develop. By week six, your baby's heart will start to pump blood and the neural tube along his/her back starts to close. During the seventh week of pregnancy, your baby's face and brain begin to develop rapidly, along with his/her eye lenses and arms. By eight weeks, your baby's legs and arms and fingers will start to form. His/her upper lip and nose start to develop and your baby's ears, eyes and nipples will become visible. By the end of the first trimester, your baby's neck, head, eyelids and genitals will start to develop. By week thirteen, your baby will be discharging urine into the amniotic fluid and his/her intestines will have moved into the abdomen. In the next few weeks, your baby's scalp, hair and skeleton will begin to develop. His/her sex will become apparent during this period. In your eighteenth week of pregnancy, your baby may be able to hear things around him/her like the beating of your heart and the blood moving through the umbilical cord.

Movement, Position & Growth of Fetus Week By Week in Pregnancy

Growth of Fetus Week By Week in Pregnancy
Growth of Fetus Week By Week in Pregnancy
Pregnancy And Baby Care Questions
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The fifth week of pregnancy is when your baby's heart, spinal cord, brain and other organs start to develop. By week six, your baby's heart will start to pump blood and the neural tube along his/her back starts to close. During the seventh week of pregnancy, your baby's face and brain begin to develop rapidly, along with his/her eye lenses and arms. By eight weeks, your baby's legs and arms and fingers will start to form. His/her upper lip and nose start to develop and your baby's ears, eyes and nipples will become visible. By the end of the first trimester, your baby's neck, head, eyelids and genitals will start to develop. By week thirteen, your baby will be discharging urine into the amniotic fluid and his/her intestines will have moved into the abdomen. In the next few weeks, your baby's scalp, hair and skeleton will begin to develop. His/her sex will become apparent during this period. In your eighteenth week of pregnancy, your baby may be able to hear things around him/her like the beating of your heart and the blood moving through the umbilical cord.

Movement, Position & Growth of Fetus Week By Week in Pregnancy Growth of Fetus Week By Week in Pregnancy
Growth of Fetus Week By Week in Pregnancy
Pregnancy And Baby Care Questions
Continued...
 By the fourth week, the zygote will attach itself to the uterine wall to nourish itself and your baby's placenta will begin to form. read more...
Pregnancy And Baby Care Questions
What Are Fetal Development Stages? How Does My Baby Develop? Does Smoking Affect Fetal Growth? Does Music Affect Fetal Development? Continued...
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The fifth week of pregnancy is when your baby's heart, spinal cord, brain and other organs start to develop. By week six, your baby's heart will start to pump blood and the neural tube along his/her back starts to close. During the seventh week of pregnancy, your baby's face and brain begin to develop rapidly, along with his/her eye lenses and arms. By eight weeks, your baby's legs and arms and fingers will start to form. His/her upper lip and nose start to develop and your baby's ears, eyes and nipples will become visible.

By the fourth week, the zygote will attach itself to the uterine wall to nourish itself and your baby's placenta will begin to form. read more...
Pregnancy And Baby Care Questions
What Are Fetal Development Stages? How Does My Baby Develop? Does Smoking Affect Fetal Growth? Does Music Affect Fetal Development? Continued...
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The fifth week of pregnancy is when your baby's heart, spinal cord, brain and other organs start to develop. By week six, your baby's heart will start to pump blood and the neural tube along his/her back starts to close. During the seventh week of pregnancy, your baby's face and brain begin to develop rapidly, along with his/her eye lenses and arms. By eight weeks, your baby's legs and arms and fingers will start to form. His/her upper lip and nose start to develop and your baby's ears, eyes and nipples will become visible.

How does an Embryo Develop Into a Fetus - Some Interesting Facts How does an Embryo Develop Into a Fetus
How does an Embryo Develop Into a Fetus
Week by week
 At this time, the first bone cells will also appear. By the end of the eighth week, the embryo is known as a fetus and looks like a mini human. Week by week
Week 1 – Within one week of conception, the fertilized egg, known as a blastocyst, will make its way to the uterus. Within days the cells will arrange themselves into two masses: the outer coat will become the placenta, while the inner cell mass becomes the fetus. All being well, the developing embryo will settle into the folds of the womb lining. Week 2 – The inner cells of the embryo divide into two layers: the ectoderm and the endoderm. The tissues and organs of the body will eventually develop from these. The amniotic sac, which will soon form a protective bubble around the embryo, also starts to develop.

How does an Embryo Develop Into a Fetus - Some Interesting Facts

How does an Embryo Develop Into a Fetus
How does an Embryo Develop Into a Fetus
Week by week

At this time, the first bone cells will also appear. By the end of the eighth week, the embryo is known as a fetus and looks like a mini human. Week by week
Week 1 – Within one week of conception, the fertilized egg, known as a blastocyst, will make its way to the uterus. Within days the cells will arrange themselves into two masses: the outer coat will become the placenta, while the inner cell mass becomes the fetus. All being well, the developing embryo will settle into the folds of the womb lining. Week 2 – The inner cells of the embryo divide into two layers: the ectoderm and the endoderm. The tissues and organs of the body will eventually develop from these. The amniotic sac, which will soon form a protective bubble around the embryo, also starts to develop.

Movement, Position & Growth of Fetus Week By Week in Pregnancy Growth of Fetus Week By Week in Pregnancy
Growth of Fetus Week By Week in Pregnancy
Pregnancy And Baby Care Questions
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 Movement, Position & Growth of Fetus Week By Week in Pregnancy
Pregnancy And Baby Care Articles During Pregnancy
Growth of Fetus Week By Week in Pregnancy
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Submitted by Pregnancy and Baby Care team on January 27, 2012
Your first week of pregnancy is generally counted as the first day of your last period. Though you will not be pregnant at this time, it is considered the first week of your fetus. Two weeks after your period is when conception generally occurs. Week three is when fertilization occurs when the sperm and egg fuse together in one of your fallopian tubes to form a zygote. If at this time, more than one egg is released and fertilized, then you may have multiple zygotes. By the fourth week, the zygote will attach itself to the uterine wall to nourish itself and your baby's placenta will begin to form. read more...
Pregnancy And Baby Care Questions
What Are Fetal Development Stages? How Does My Baby Develop? Does Smoking Affect Fetal Growth? Does Music Affect Fetal Development?

Movement, Position & Growth of Fetus Week By Week in Pregnancy
Pregnancy And Baby Care Articles During Pregnancy
Growth of Fetus Week By Week in Pregnancy
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Submitted by Pregnancy and Baby Care team on January 27, 2012
Your first week of pregnancy is generally counted as the first day of your last period. Though you will not be pregnant at this time, it is considered the first week of your fetus. Two weeks after your period is when conception generally occurs. Week three is when fertilization occurs when the sperm and egg fuse together in one of your fallopian tubes to form a zygote. If at this time, more than one egg is released and fertilized, then you may have multiple zygotes. By the fourth week, the zygote will attach itself to the uterine wall to nourish itself and your baby's placenta will begin to form. read more...
Pregnancy And Baby Care Questions
What Are Fetal Development Stages? How Does My Baby Develop? Does Smoking Affect Fetal Growth? Does Music Affect Fetal Development?

How does an Embryo Develop Into a Fetus - Some Interesting Facts How does an Embryo Develop Into a Fetus
How does an Embryo Develop Into a Fetus
Week by week
 Ears, nose, fingers and toes are just beginning to appear. Week 7 – The embryo’s eyelids begin to form from a single membrane that remains fused for several days. At this stage in development, the limb muscles are beginning to form. The chest cavity will be separated from the abdominal cavity by a band of muscles; this will later develop into the diaphragm. Week 8 – Between the fourth and eighth weeks, the brain has grown so rapidly that the head is extremely large in proportion to the rest of the body. The gonads, or sex glands, will now start to develop into ovaries or testes. The elbows, fingers, knees and toes are really taking shape. Inside the chest cavity, the lungs are developing too. At the end of the eight-week period, the embryo becomes a fetus.

Ears, nose, fingers and toes are just beginning to appear. Week 7 – The embryo’s eyelids begin to form from a single membrane that remains fused for several days. At this stage in development, the limb muscles are beginning to form. The chest cavity will be separated from the abdominal cavity by a band of muscles; this will later develop into the diaphragm. Week 8 – Between the fourth and eighth weeks, the brain has grown so rapidly that the head is extremely large in proportion to the rest of the body. The gonads, or sex glands, will now start to develop into ovaries or testes. The elbows, fingers, knees and toes are really taking shape. Inside the chest cavity, the lungs are developing too. At the end of the eight-week period, the embryo becomes a fetus.

Fetal Development Stages Week by Week | Parents Fetal Development
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 Fetal Development Stages Week by Week | Parents
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Pregnancy & Birth
Pregnancy Development Stages
Fetal Development
Fetal Development
Fetal Development
From a tiny cluster of cells to a bouncing baby - fetal development is an amazing process. Here you'll see pictures of how a fetus develops each week, and each trimester. Plus what's happening to your baby throughout the fetal development process. Most Recent
Little sister touching pregnant sister's belly
Quickening in Pregnancy: Feeling the First Fetal Kicks
Quickening in Pregnancy: Feeling the First Fetal Kicks
Many moms-to-be wonder when they’ll feel fetal movements for the first time. Here’s your guide to understanding “quickening” during pregnancy. Read More
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Language Development in Womb
Study Shows Language Development Starts in the Womb
Study Shows Language Development Starts in the Womb
New research reveals that babies in the womb can already distinguish between different languages. Read More
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An Embryo Forms:

Fetal Development Stages Week by Week | Parents

Fetal Development
Fetal Development
Most Recent
Quickening in Pregnancy: Feeling the First Fetal Kicks
Quickening in Pregnancy: Feeling the First Fetal Kicks
Study Shows Language Development Starts in the Womb
An Embryo Forms: Weeks 4 to 8 of Pregnancy
Developing Senses: Weeks 22 to 25 of Pregnancy
Sleep Cycles: Weeks 26 to 30 of Pregnancy
Second Trimester Begins: Weeks 13 to 17 of Pregnancy
More Fetal Development
This NFL Star and His Wife Had a Prenatal Testing Scare—Now They're Talking About It
This NFL Star and His Wife Had a Prenatal Testing Scare—Now They're Talking About It
The Inside Story: Your Baby in Weeks 1 Through 4
The Inside Story: Your Baby in Weeks 1 Through 4
Counting Fetal Movements
Counting Fetal Movements
Pregnancy, Month-by-Month
Pregnancy, Month-by-Month
Second Trimester Ultrasound Pictures
Second Trimester Ultrasound Pictures
What Does a Baby Kick Feel Like?
What Does a Baby Kick Feel Like?
Twins: A Closer Look at Your Developing Babies
Week 29 Ultrasound: What It Would Look Like
Week 30 Ultrasound: What It Would Look Like
Week 32 Ultrasound: What It Would Look Like
Week 34 Ultrasound: What It Would Look Like
Week 31 Ultrasound: What It Would Look Like

Fetal Development Stages Week by Week | Parents
Home
Pregnancy & Birth
Pregnancy Development Stages
Fetal Development
Fetal Development
Fetal Development
From a tiny cluster of cells to a bouncing baby - fetal development is an amazing process. Here you'll see pictures of how a fetus develops each week, and each trimester. Plus what's happening to your baby throughout the fetal development process. Most Recent
Little sister touching pregnant sister's belly
Quickening in Pregnancy: Feeling the First Fetal Kicks
Quickening in Pregnancy: Feeling the First Fetal Kicks
Many moms-to-be wonder when they’ll feel fetal movements for the first time. Here’s your guide to understanding “quickening” during pregnancy. Read More
Next
Language Development in Womb
Study Shows Language Development Starts in the Womb
Study Shows Language Development Starts in the Womb
New research reveals that babies in the womb can already distinguish between different languages. Read More
Next
An Embryo Forms: Weeks 4 to 8 of Pregnancy
An Embryo Forms:

Pregnancy Guide, Stages of Pregnancy, Fetus Growth Week-by-Week Pregnancy Guide
Week-by-Week Pregnancy Guide
Trimester One - Weeks One through 12
First Trimester Fetal Development
Trimester Two - Weeks 13 through 27
Second Trimester Fetal Development
Trimester Three - Weeks 28 through 40
Third Trimester Fetal Development
Find a Fertility Clinic
 The fetus weighs a little over half a pound and is about six inches long. Week 21: During this week, the bone marrow takes over red blood cell production from the liver and spleen. The fetus begins swallowing small amounts of sugar in the amniotic fluid. Week 22: The fetus is now able to sense taste and touch. For male fetuses, the testes descend into the abdomen. Week 23: The fetus begins to practice breathing by drawing amniotic fluid into and out of the lungs. The skin continues to mature and fat deposits increase.

Pregnancy Guide, Stages of Pregnancy, Fetus Growth

Week-by-Week Pregnancy Guide
Week-by-Week Pregnancy Guide
Trimester One - Weeks One through 12
First Trimester Fetal Development
Trimester Two - Weeks 13 through 27
Second Trimester Fetal Development
Trimester Three - Weeks 28 through 40
Third Trimester Fetal Development
Find a Fertility Clinic

The fetus weighs a little over half a pound and is about six inches long. Week 21: During this week, the bone marrow takes over red blood cell production from the liver and spleen. The fetus begins swallowing small amounts of sugar in the amniotic fluid. Week 22: The fetus is now able to sense taste and touch. For male fetuses, the testes descend into the abdomen. Week 23: The fetus begins to practice breathing by drawing amniotic fluid into and out of the lungs. The skin continues to mature and fat deposits increase.

Fetal Development Stages: Month by Month Embryo Pictures Fetal Development: Month by Month
Fetal Development: Month by Month
Your Baby's Growth: Conception to Birth
Conception
Baby's Development at 4 Weeks
Baby's Development at 8 Weeks
Baby’s Development at 12 Weeks
Baby's Development at 16 Weeks
Baby's Development at 20 Weeks
It's Time for an Ultrasound
Baby's Development at 24 Weeks
Baby's Development at 28 Weeks
Baby's Development at 32 Weeks
Baby's Development at 36 Weeks
Birth!
 In this slideshow we will look inside the womb to see how a baby develops through the first, second, and third trimesters. Conception
Step one of conception is when the sperm penetrates the egg to complete the genetic make-up of a human fetus. At this moment (conception), the sex and genetic make-up of the fetus begins. About three days later, the fertilized egg cell divides rapidly and then passes through the Fallopian tube into the uterus, where it attaches to the uterine wall. The attachment site provides nourishment to the rapidly developing fetus and becomes the placenta. Baby's Development at 4 Weeks
After 4 weeks, the basic structures of the embryo have begun to develop into separate areas that will form the head, chest, abdomen, and the organs contained within them. Small buds on the surface will become arms and legs. A home pregnancy test should be positive at this stage of development (most tests claim positive results one week after a missed period). Baby's Development at 8 Weeks
At 8 weeks, the fetus is about a half-inch long (1.1cm). Facial features such as developing ears, eyelids, and nose tip are present.

Fetal Development Stages: Month by Month Embryo Pictures

Fetal Development: Month by Month
Fetal Development: Month by Month
Your Baby's Growth: Conception to Birth
Conception
Baby's Development at 4 Weeks
Baby's Development at 8 Weeks
Baby’s Development at 12 Weeks
Baby's Development at 16 Weeks
Baby's Development at 20 Weeks
It's Time for an Ultrasound
Baby's Development at 24 Weeks
Baby's Development at 28 Weeks
Baby's Development at 32 Weeks
Baby's Development at 36 Weeks
Birth!

In this slideshow we will look inside the womb to see how a baby develops through the first, second, and third trimesters. Conception
Step one of conception is when the sperm penetrates the egg to complete the genetic make-up of a human fetus. At this moment (conception), the sex and genetic make-up of the fetus begins. About three days later, the fertilized egg cell divides rapidly and then passes through the Fallopian tube into the uterus, where it attaches to the uterine wall. The attachment site provides nourishment to the rapidly developing fetus and becomes the placenta. Baby's Development at 4 Weeks
After 4 weeks, the basic structures of the embryo have begun to develop into separate areas that will form the head, chest, abdomen, and the organs contained within them. Small buds on the surface will become arms and legs. A home pregnancy test should be positive at this stage of development (most tests claim positive results one week after a missed period). Baby's Development at 8 Weeks
At 8 weeks, the fetus is about a half-inch long (1.1cm). Facial features such as developing ears, eyelids, and nose tip are present.

Pregnancy Guide, Stages of Pregnancy, Fetus Growth Week-by-Week Pregnancy Guide
Week-by-Week Pregnancy Guide
Trimester One - Weeks One through 12
First Trimester Fetal Development
Trimester Two - Weeks 13 through 27
Second Trimester Fetal Development
Trimester Three - Weeks 28 through 40
Third Trimester Fetal Development
Find a Fertility Clinic
 Week 15: Skin begins to form. Bone and marrow that will comprise the skeleton continue to form. Week 16: Fetuses are able to make facial expressions, hiccup, and make a fist. Female fetuses are forming millions of eggs in the ovaries. Week 17: Fat stores that will protect the organs after birth begin to develop under the skin. Week 18: The fetus is able to hear and swallow.

Week 15: Skin begins to form. Bone and marrow that will comprise the skeleton continue to form. Week 16: Fetuses are able to make facial expressions, hiccup, and make a fist. Female fetuses are forming millions of eggs in the ovaries. Week 17: Fat stores that will protect the organs after birth begin to develop under the skin. Week 18: The fetus is able to hear and swallow.

Fetus - Wikipedia Fetus
Fetus
Contents
Etymology
Development
Weeks 9 to 16 (2 to 3.6 months)
Weeks 17 to 25 (3.6 to 6.6 months)
Weeks 26 to 38 (6.6 to 8.6 months)
Variation in growth
Viability
Circulatory system
Before birth
Postnatal development
Immune system
Developmental problems
Fetal pain
Legal and social issues
Other animals
See also
References
External links
 The genitalia of the fetus starts to form and placenta becomes fully functional during week 9. At this point in development, uncontrolled movements and twitches occur as muscles, the brain, and pathways begin to develop. Weeks 17 to 25 (3.6 to 6.6 months)
A woman pregnant for the first time ( nulliparous) typically feels fetal movements at about 21 weeks, whereas a woman who has given birth before will typically feel movements by 20 weeks. By the end of the fifth month, the fetus is about 20 cm (8 inches) long. Weeks 26 to 38 (6.6 to 8.6 months)
Artist's depiction of fetus at 40 weeks gestational age, about 51 cm (20 in) from head to toe. The amount of body fat rapidly increases. Lungs are not fully mature. Thalamic brain connections, which mediate sensory input, form. Bones are fully developed, but are still soft and pliable. Iron, calcium, and phosphorus become more abundant.

Fetus - Wikipedia

Fetus
Fetus
Contents
Etymology
Development
Weeks 9 to 16 (2 to 3.6 months)
Weeks 17 to 25 (3.6 to 6.6 months)
Weeks 26 to 38 (6.6 to 8.6 months)
Variation in growth
Viability
Circulatory system
Before birth
Postnatal development
Immune system
Developmental problems
Fetal pain
Legal and social issues
Other animals
See also
References
External links

The genitalia of the fetus starts to form and placenta becomes fully functional during week 9. At this point in development, uncontrolled movements and twitches occur as muscles, the brain, and pathways begin to develop. Weeks 17 to 25 (3.6 to 6.6 months)
A woman pregnant for the first time ( nulliparous) typically feels fetal movements at about 21 weeks, whereas a woman who has given birth before will typically feel movements by 20 weeks. By the end of the fifth month, the fetus is about 20 cm (8 inches) long. Weeks 26 to 38 (6.6 to 8.6 months)
Artist's depiction of fetus at 40 weeks gestational age, about 51 cm (20 in) from head to toe. The amount of body fat rapidly increases. Lungs are not fully mature. Thalamic brain connections, which mediate sensory input, form. Bones are fully developed, but are still soft and pliable. Iron, calcium, and phosphorus become more abundant.

Fetal Period | The final stage of fetal development Fetal Period
Fetal Period
The final stage of fetal development
Weeks 10 to 12
Weeks 13 to 16
Weeks 17 to 20
Weeks 21 to 25
Weeks 26 to 28
Weeks 29 to 36
Weeks 37 to 40
 Meconium, a thick, dark green waste substance, is produced in the fetus' bowels and remains there (in most cases) until after birth. Weeks 17 to 20
Week 17 to week 20 is a period of rapid growth for the fetus. It begins to accumulate a layer of fat underneath its skin and starts to progress through somewhat regular intervals of wakefulness and sleep. Increased fetal movement is likely to become apparent, in the form of a fluttering sensation in the mother's abdomen. During this period, the sex of the baby can be discovered via ultrasonography. Weeks 21 to 25
Between weeks 21and 25, the fetus becomes covered in lanugo. Eyelashes and fingernails begin to develop. Around this time, doctors are first able to hear the fetal heartbeat using a stethoscope. Movement continues to increase and the fetus develops a startle reflex. Weeks 26 to 28
From week 26 to 28, the lungs are rapidly developing as the fetus readies for its first breath of air.

Fetal Period | The final stage of fetal development

Fetal Period
Fetal Period
The final stage of fetal development
Weeks 10 to 12
Weeks 13 to 16
Weeks 17 to 20
Weeks 21 to 25
Weeks 26 to 28
Weeks 29 to 36
Weeks 37 to 40

Meconium, a thick, dark green waste substance, is produced in the fetus' bowels and remains there (in most cases) until after birth. Weeks 17 to 20
Week 17 to week 20 is a period of rapid growth for the fetus. It begins to accumulate a layer of fat underneath its skin and starts to progress through somewhat regular intervals of wakefulness and sleep. Increased fetal movement is likely to become apparent, in the form of a fluttering sensation in the mother's abdomen. During this period, the sex of the baby can be discovered via ultrasonography. Weeks 21 to 25
Between weeks 21and 25, the fetus becomes covered in lanugo. Eyelashes and fingernails begin to develop. Around this time, doctors are first able to hear the fetal heartbeat using a stethoscope. Movement continues to increase and the fetus develops a startle reflex. Weeks 26 to 28
From week 26 to 28, the lungs are rapidly developing as the fetus readies for its first breath of air.

Fetal Development Stages: Month by Month Embryo Pictures Fetal Development: Month by Month
Fetal Development: Month by Month
Your Baby's Growth: Conception to Birth
Conception
Baby's Development at 4 Weeks
Baby's Development at 8 Weeks
Baby’s Development at 12 Weeks
Baby's Development at 16 Weeks
Baby's Development at 20 Weeks
It's Time for an Ultrasound
Baby's Development at 24 Weeks
Baby's Development at 28 Weeks
Baby's Development at 32 Weeks
Baby's Development at 36 Weeks
Birth!
 The limb buds are now clearly arms and legs, while the fingers and toes are still developing. Baby’s Development at 12 Weeks
At 12 weeks, the fetus has grown to about 2 inches (4.4cm) in length and may begin to move by itself. The fingers and toes are discernible, and the fetal heartbeat may be audible by Doppler ultrasound. The developing sex organs may be identified by ultrasound techniques. Baby's Development at 16 Weeks
At 16 weeks, the fetus is about 4 and one-half inches long and resembles an infant; the eyes blink, the heartbeat is easier to locate, facial features (nose, mouth, chin and ears) are distinct, and the fingers and toes are clearly developed; the skin on the fingers and toes even has distinct patterns (fingerprints!). Women should be able to feel the uterus at about 3 inches (6.6 cm) below the belly button; this is the beginning of the "baby bump" (abdominal swelling due to an expanding uterus) in some women. Baby's Development at 20 Weeks
At 20 weeks, the developing fetus is about 6 inches long (13.2 cm) and may weigh about 10 ounces.

The limb buds are now clearly arms and legs, while the fingers and toes are still developing. Baby’s Development at 12 Weeks
At 12 weeks, the fetus has grown to about 2 inches (4.4cm) in length and may begin to move by itself. The fingers and toes are discernible, and the fetal heartbeat may be audible by Doppler ultrasound. The developing sex organs may be identified by ultrasound techniques. Baby's Development at 16 Weeks
At 16 weeks, the fetus is about 4 and one-half inches long and resembles an infant; the eyes blink, the heartbeat is easier to locate, facial features (nose, mouth, chin and ears) are distinct, and the fingers and toes are clearly developed; the skin on the fingers and toes even has distinct patterns (fingerprints!). Women should be able to feel the uterus at about 3 inches (6.6 cm) below the belly button; this is the beginning of the "baby bump" (abdominal swelling due to an expanding uterus) in some women. Baby's Development at 20 Weeks
At 20 weeks, the developing fetus is about 6 inches long (13.2 cm) and may weigh about 10 ounces.

First Trimester Fetal development information How your baby is developing growing inside you in months one two three month 1, 2 or 3 First Trimester:
Weeks, Months and Trimesters Guides
First Trimester:
Week By Week Pregnancy Calendar
 All of the organs, muscles, and nerves are in place and beginning to function. The eyelids have fused shut and won't open again until week 27. As the hands and feet develop fingers and toes, they lose their paddle-like look, and the touch pads on the fingers form. 10 weeks - The fetus weighs about 1/3 of an ounce. The heart is almost completely developed and very much resembles that of a newborn baby. An opening the atrium of the heart and the presence of a bypass valve divert much of the blood away from the lungs, as the child's blood is oxygenated through the placenta. The wrists and ankles have formed and the fingers and toes are clearly visible. Genitals have begun to from, but it is too early to tell the sex of the fetus. By this week of the pregnancy the placenta has developed enough to support most of the critical job of producing hormones. 11 weeks - The vital organs - the liver, kidneys, intestines, brain and lungs are almost fully formed and beginning to function, while the the head is almost half the length of the entire body.

First Trimester Fetal development information How your baby is developing growing inside you in months one two three month 1, 2 or 3

First Trimester:
Weeks, Months and Trimesters Guides
First Trimester:
Week By Week Pregnancy Calendar

All of the organs, muscles, and nerves are in place and beginning to function. The eyelids have fused shut and won't open again until week 27. As the hands and feet develop fingers and toes, they lose their paddle-like look, and the touch pads on the fingers form. 10 weeks - The fetus weighs about 1/3 of an ounce. The heart is almost completely developed and very much resembles that of a newborn baby. An opening the atrium of the heart and the presence of a bypass valve divert much of the blood away from the lungs, as the child's blood is oxygenated through the placenta. The wrists and ankles have formed and the fingers and toes are clearly visible. Genitals have begun to from, but it is too early to tell the sex of the fetus. By this week of the pregnancy the placenta has developed enough to support most of the critical job of producing hormones. 11 weeks - The vital organs - the liver, kidneys, intestines, brain and lungs are almost fully formed and beginning to function, while the the head is almost half the length of the entire body.

Pregnancy Guide, Stages of Pregnancy, Fetus Growth Week-by-Week Pregnancy Guide
Week-by-Week Pregnancy Guide
Trimester One - Weeks One through 12
First Trimester Fetal Development
Trimester Two - Weeks 13 through 27
Second Trimester Fetal Development
Trimester Three - Weeks 28 through 40
Third Trimester Fetal Development
Find a Fertility Clinic
 Female fetuses are forming millions of eggs in the ovaries. Week 17: Fat stores that will protect the organs after birth begin to develop under the skin. Week 18: The fetus is able to hear and swallow. Week 19: The fetus can now make reflexive muscle movements. A fine layer of hair called lanugo, and a pasty white coating called vernix, cover the skin. Week 20: The skin thickens, and the limbs are well-developed.

Female fetuses are forming millions of eggs in the ovaries. Week 17: Fat stores that will protect the organs after birth begin to develop under the skin. Week 18: The fetus is able to hear and swallow. Week 19: The fetus can now make reflexive muscle movements. A fine layer of hair called lanugo, and a pasty white coating called vernix, cover the skin. Week 20: The skin thickens, and the limbs are well-developed.

Fetal Development Stages: Month by Month Embryo Pictures Fetal Development: Month by Month
Fetal Development: Month by Month
Your Baby's Growth: Conception to Birth
Conception
Baby's Development at 4 Weeks
Baby's Development at 8 Weeks
Baby’s Development at 12 Weeks
Baby's Development at 16 Weeks
Baby's Development at 20 Weeks
It's Time for an Ultrasound
Baby's Development at 24 Weeks
Baby's Development at 28 Weeks
Baby's Development at 32 Weeks
Baby's Development at 36 Weeks
Birth!
 Baby's Development at 4 Weeks
After 4 weeks, the basic structures of the embryo have begun to develop into separate areas that will form the head, chest, abdomen, and the organs contained within them. Small buds on the surface will become arms and legs. A home pregnancy test should be positive at this stage of development (most tests claim positive results one week after a missed period). Baby's Development at 8 Weeks
At 8 weeks, the fetus is about a half-inch long (1.1cm). Facial features such as developing ears, eyelids, and nose tip are present. The limb buds are now clearly arms and legs, while the fingers and toes are still developing. Baby’s Development at 12 Weeks
At 12 weeks, the fetus has grown to about 2 inches (4.4cm) in length and may begin to move by itself. The fingers and toes are discernible, and the fetal heartbeat may be audible by Doppler ultrasound. The developing sex organs may be identified by ultrasound techniques. Baby's Development at 16 Weeks
At 16 weeks, the fetus is about 4 and one-half inches long and resembles an infant;

Baby's Development at 4 Weeks
After 4 weeks, the basic structures of the embryo have begun to develop into separate areas that will form the head, chest, abdomen, and the organs contained within them. Small buds on the surface will become arms and legs. A home pregnancy test should be positive at this stage of development (most tests claim positive results one week after a missed period). Baby's Development at 8 Weeks
At 8 weeks, the fetus is about a half-inch long (1.1cm). Facial features such as developing ears, eyelids, and nose tip are present. The limb buds are now clearly arms and legs, while the fingers and toes are still developing. Baby’s Development at 12 Weeks
At 12 weeks, the fetus has grown to about 2 inches (4.4cm) in length and may begin to move by itself. The fingers and toes are discernible, and the fetal heartbeat may be audible by Doppler ultrasound. The developing sex organs may be identified by ultrasound techniques. Baby's Development at 16 Weeks
At 16 weeks, the fetus is about 4 and one-half inches long and resembles an infant;

Week 21 - Month 5 Fetal Nourishment development information your baby is growing inside you over weeks months trimesters Week Twenty One: Nourishment evolves
Week Twenty One: Nourishment evolves
Week By Week Pregnancy Calendar
 The placenta has provided nearly all of your baby's nourishment, now your baby will begin to absorb small amounts of sugar from swallowed amniotic fluid. Based on the size of baby's head, which is about 2 inches (5cm), the date of birth can be determined to within one week. The fetus is steadily gaining fat and has grown a whitish coat of a slick, fatty substance to protect skin in amniotic fluid and to ease delivery. In girls, the vagina is formed and the ovaries already contain over six million eggs which will be reduced to about 400 by the time of puberty. For boys, the testes begin to descend from the abdomen this week. ( Boys don't produce sperm until puberty). The baby can hear and recognize the mother's voice, and may respond to some types of music. <<< Week 20 | Month 5 | Month 6 | Week 22 >>>

Week By Week Pregnancy Calendar

First Trimester
Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7
Week 8 Week 9 Week 10 Week 11 Week 12 Week 13
Second Trimester
Week 14 Week 15 Week 16 Week 17 Week 18 Week 19 Week 20
Week 21 Week 22 Week 23 Week 24 Week 25 Week 26
Third Trimester
Week 27 Week 28 Week 29 Week 30 Week 31 Week 32 Week 33
Week 34 Week 35 Week 36 Week 37 Week 38 Week 39 Week 40

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Week 21 - Month 5 Fetal Nourishment development information your baby is growing inside you over weeks months trimesters

Week Twenty One: Nourishment evolves
Week Twenty One: Nourishment evolves
Week By Week Pregnancy Calendar

The placenta has provided nearly all of your baby's nourishment, now your baby will begin to absorb small amounts of sugar from swallowed amniotic fluid. Based on the size of baby's head, which is about 2 inches (5cm), the date of birth can be determined to within one week. The fetus is steadily gaining fat and has grown a whitish coat of a slick, fatty substance to protect skin in amniotic fluid and to ease delivery. In girls, the vagina is formed and the ovaries already contain over six million eggs which will be reduced to about 400 by the time of puberty. For boys, the testes begin to descend from the abdomen this week. ( Boys don't produce sperm until puberty). The baby can hear and recognize the mother's voice, and may respond to some types of music. <<< Week 20 | Month 5 | Month 6 | Week 22 >>>

Week By Week Pregnancy Calendar

First Trimester
Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7
Week 8 Week 9 Week 10 Week 11 Week 12 Week 13
Second Trimester
Week 14 Week 15 Week 16 Week 17 Week 18 Week 19 Week 20
Week 21 Week 22 Week 23 Week 24 Week 25 Week 26
Third Trimester
Week 27 Week 28 Week 29 Week 30 Week 31 Week 32 Week 33
Week 34 Week 35 Week 36 Week 37 Week 38 Week 39 Week 40

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Fetal development: The 1st trimester - Mayo Clinic
Fetal development: The 1st trimester
Weeks 1 and 2: Getting ready
Week 3: Fertilization
Week 4: Implantation
Week 5: Hormone levels increase
Week 6: The neural tube closes
Week 7: Baby's head develops
Week 8: Baby's nose forms
Week 9: Baby's toes appear
Week 10: Baby's elbows bend
Week 11: Baby's genitals develop
Week 12: Baby's fingernails form
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 Week 11: Baby's genitals develop
At the beginning of the 11th week of pregnancy, or the ninth week after conception, your baby's head still makes up about half of its length. However, your baby's body is about to catch up. Your baby is now officially described as a fetus. This week your baby's face is broad, the eyes widely separated, the eyelids fused and the ears low set. Buds for future teeth appear. Red blood cells are beginning to form in your baby's liver. By the end of this week, your baby's external genitalia will start developing into a penis or a clitoris and labia majora. By now your baby might measure about 2 inches (50 millimeters) long from crown to rump — the length of the short side of a credit card — and weigh almost 1/3 ounce (8 grams). Week 12:

Fetal development: The 1st trimester - Mayo Clinic

Fetal development: The 1st trimester
Weeks 1 and 2: Getting ready
Week 3: Fertilization
Week 4: Implantation
Week 5: Hormone levels increase
Week 6: The neural tube closes
Week 7: Baby's head develops
Week 8: Baby's nose forms
Week 9: Baby's toes appear
Week 10: Baby's elbows bend
Week 11: Baby's genitals develop
Week 12: Baby's fingernails form
Products and Services

Week 11: Baby's genitals develop
At the beginning of the 11th week of pregnancy, or the ninth week after conception, your baby's head still makes up about half of its length. However, your baby's body is about to catch up. Your baby is now officially described as a fetus. This week your baby's face is broad, the eyes widely separated, the eyelids fused and the ears low set. Buds for future teeth appear. Red blood cells are beginning to form in your baby's liver. By the end of this week, your baby's external genitalia will start developing into a penis or a clitoris and labia majora. By now your baby might measure about 2 inches (50 millimeters) long from crown to rump — the length of the short side of a credit card — and weigh almost 1/3 ounce (8 grams). Week 12:

Pregnancy Guide, Stages of Pregnancy, Fetus Growth Week-by-Week Pregnancy Guide
Week-by-Week Pregnancy Guide
Trimester One - Weeks One through 12
First Trimester Fetal Development
Trimester Two - Weeks 13 through 27
Second Trimester Fetal Development
Trimester Three - Weeks 28 through 40
Third Trimester Fetal Development
Find a Fertility Clinic
 Week 19: The fetus can now make reflexive muscle movements. A fine layer of hair called lanugo, and a pasty white coating called vernix, cover the skin. Week 20: The skin thickens, and the limbs are well-developed. The fetus weighs a little over half a pound and is about six inches long. Week 21: During this week, the bone marrow takes over red blood cell production from the liver and spleen. The fetus begins swallowing small amounts of sugar in the amniotic fluid. Week 22:

Week 19: The fetus can now make reflexive muscle movements. A fine layer of hair called lanugo, and a pasty white coating called vernix, cover the skin. Week 20: The skin thickens, and the limbs are well-developed. The fetus weighs a little over half a pound and is about six inches long. Week 21: During this week, the bone marrow takes over red blood cell production from the liver and spleen. The fetus begins swallowing small amounts of sugar in the amniotic fluid. Week 22:

Prenatal Development | Lifespan Development
Prenatal Development
Learning Outcomes
Periods of Prenatal Development
The Germinal Period (Weeks 1-2)
The Embryonic Period (Weeks 3-8)
The Fetal Period (Weeks 9-40)
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Glossary
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 By the 12th week, the fetus has all its body parts including external genitalia. In the following weeks, the fetus will develop hair, nails, teeth and the excretory and digestive systems will continue to develop. At the end of the 12th week, the fetus is about 3 inches long and weighs about 28 grams. At about 16 weeks, the fetus is approximately 4.5 inches long. Fingers and toes are fully developed, and fingerprints are visible. During the 4-6th months, the eyes become more sensitive to light and hearing develops. The respiratory system continues to develop. Reflexes such as sucking, swallowing and hiccuping develop during the 5th month. Cycles of sleep and wakefulness are present at that time as well. Throughout the fetal stage, the brain continues to grow and develop, nearly doubling in size from weeks 16 to 28.

Prenatal Development | Lifespan Development

Prenatal Development
Learning Outcomes
Periods of Prenatal Development
The Germinal Period (Weeks 1-2)
The Embryonic Period (Weeks 3-8)
The Fetal Period (Weeks 9-40)
Watch It
Try It
Glossary
Contribute!

By the 12th week, the fetus has all its body parts including external genitalia. In the following weeks, the fetus will develop hair, nails, teeth and the excretory and digestive systems will continue to develop. At the end of the 12th week, the fetus is about 3 inches long and weighs about 28 grams. At about 16 weeks, the fetus is approximately 4.5 inches long. Fingers and toes are fully developed, and fingerprints are visible. During the 4-6th months, the eyes become more sensitive to light and hearing develops. The respiratory system continues to develop. Reflexes such as sucking, swallowing and hiccuping develop during the 5th month. Cycles of sleep and wakefulness are present at that time as well. Throughout the fetal stage, the brain continues to grow and develop, nearly doubling in size from weeks 16 to 28.

Embryo vs. Fetus: What’s the Difference? Embryo vs. Fetus: Fetal Development Week-by-Week
Embryo vs. Fetus: Fetal Development Week-by-Week
What’s a Zygote?
Embryo vs. Fetus
The First 10 Weeks of Pregnancy
Weeks 1 and 2: Preparation
Week 3: Ovulation
Week 4: Implantation
Week 5: Embryonic Period Starts
Week 6
Week 7
Week 8
Week 9
Week 10: Embryonic Period Ends
Week 11 and Beyond
Late First Trimester
Second Trimester
Third Trimester
Miscarriage
Your First Prenatal Appointment: What to Expect
The Takeaway
 It’s responsible for your baby’s bones, muscles, kidneys, and reproductive system. The last layer is the endoderm. It’s where your baby’s lungs, intestines, and bladder will later develop. Week 6
Baby’s heart starts to beat at the start of this week. Your doctor may even be able to detect it on an ultrasound. Your baby doesn’t look like the one you’ll bring home from the hospital yet, but they’re gaining some very basic facial features, plus arm and leg buds. Week 7
Baby’s brain and head are further developing in week 7. Those buds of arms and legs have turned into paddles. Your baby is still as tiny as a pencil eraser, but they already have little nostrils. The lenses of their eyes are beginning to form.

Embryo vs. Fetus: What’s the Difference?

Embryo vs. Fetus: Fetal Development Week-by-Week
Embryo vs. Fetus: Fetal Development Week-by-Week
What’s a Zygote?
Embryo vs. Fetus
The First 10 Weeks of Pregnancy
Weeks 1 and 2: Preparation
Week 3: Ovulation
Week 4: Implantation
Week 5: Embryonic Period Starts
Week 6
Week 7
Week 8
Week 9
Week 10: Embryonic Period Ends
Week 11 and Beyond
Late First Trimester
Second Trimester
Third Trimester
Miscarriage
Your First Prenatal Appointment: What to Expect
The Takeaway

It’s responsible for your baby’s bones, muscles, kidneys, and reproductive system. The last layer is the endoderm. It’s where your baby’s lungs, intestines, and bladder will later develop. Week 6
Baby’s heart starts to beat at the start of this week. Your doctor may even be able to detect it on an ultrasound. Your baby doesn’t look like the one you’ll bring home from the hospital yet, but they’re gaining some very basic facial features, plus arm and leg buds. Week 7
Baby’s brain and head are further developing in week 7. Those buds of arms and legs have turned into paddles. Your baby is still as tiny as a pencil eraser, but they already have little nostrils. The lenses of their eyes are beginning to form.

Fetal Period | The final stage of fetal development Fetal Period
Fetal Period
The final stage of fetal development
Weeks 10 to 12
Weeks 13 to 16
Weeks 17 to 20
Weeks 21 to 25
Weeks 26 to 28
Weeks 29 to 36
Weeks 37 to 40
 Weeks 21 to 25
Between weeks 21and 25, the fetus becomes covered in lanugo. Eyelashes and fingernails begin to develop. Around this time, doctors are first able to hear the fetal heartbeat using a stethoscope. Movement continues to increase and the fetus develops a startle reflex. Weeks 26 to 28
From week 26 to 28, the lungs are rapidly developing as the fetus readies for its first breath of air. By week 28, gas exchange is possible and the fetus may survive outside of the womb. The brain is also developing at a fast pace and the fetus' nervous system begins to control some of its bodily functions. Around week 28, the eyelids open for the first time since early in the embryonic period of development. Weeks 29 to 36
Between weeks 29 and 35, the lungs continue to develop and the fetus puts on weight (much of it in the form of body fat). The fetus develops its first immunities, increasing the likelihood of survival should a premature birth take place (by week 36, an infant has a high probability of survival, provided it receives sufficient medical care).

Weeks 21 to 25
Between weeks 21and 25, the fetus becomes covered in lanugo. Eyelashes and fingernails begin to develop. Around this time, doctors are first able to hear the fetal heartbeat using a stethoscope. Movement continues to increase and the fetus develops a startle reflex. Weeks 26 to 28
From week 26 to 28, the lungs are rapidly developing as the fetus readies for its first breath of air. By week 28, gas exchange is possible and the fetus may survive outside of the womb. The brain is also developing at a fast pace and the fetus' nervous system begins to control some of its bodily functions. Around week 28, the eyelids open for the first time since early in the embryonic period of development. Weeks 29 to 36
Between weeks 29 and 35, the lungs continue to develop and the fetus puts on weight (much of it in the form of body fat). The fetus develops its first immunities, increasing the likelihood of survival should a premature birth take place (by week 36, an infant has a high probability of survival, provided it receives sufficient medical care).

Infants Remembered In Silence (IRIS) - Resources - Fetal Development Conception - 40 Weeks
 Sometime during this week or the next week, blood will begin to circulate between the baby and uterus and the placenta starts to function. Week 12

By this point, nearly all of the organs and structures of the fetus are formed. They will continue to grow and develop until delivery. Fingers and toes have separated and hair and nails begin to grow. The genitals begin to take on their gender characteristics. Amniotic fluid begins to accumulate as the baby's kidneys begin to produce and excrete urine. The muscles in the intestinal walls begin to practice peristalsis - contractions within the intestines that digest food. Week 13

As the baby continues to develop, the vocal cords begin to form. The face is looking more and more human each day as the eyes begin to move closer together instead of being on the sides of the head and the ears move to a normal position. It would be possible now to determine the baby's sex by looking at the genitals if we could only get close enough. (

Infants Remembered In Silence (IRIS) - Resources - Fetal Development Conception - 40 Weeks

Sometime during this week or the next week, blood will begin to circulate between the baby and uterus and the placenta starts to function. Week 12

By this point, nearly all of the organs and structures of the fetus are formed. They will continue to grow and develop until delivery. Fingers and toes have separated and hair and nails begin to grow. The genitals begin to take on their gender characteristics. Amniotic fluid begins to accumulate as the baby's kidneys begin to produce and excrete urine. The muscles in the intestinal walls begin to practice peristalsis - contractions within the intestines that digest food. Week 13

As the baby continues to develop, the vocal cords begin to form. The face is looking more and more human each day as the eyes begin to move closer together instead of being on the sides of the head and the ears move to a normal position. It would be possible now to determine the baby's sex by looking at the genitals if we could only get close enough. (

Fetal Period | The final stage of fetal development Fetal Period
Fetal Period
The final stage of fetal development
Weeks 10 to 12
Weeks 13 to 16
Weeks 17 to 20
Weeks 21 to 25
Weeks 26 to 28
Weeks 29 to 36
Weeks 37 to 40
 Its eyelids close during this period and do not open again until around the 7th month of development in the womb. The ears begin to take their final shape and tooth buds appear. The fetus' genitals are clearly differentiated at this point and may even be visible via ultrasound as early as week 12 (although sex prediction ultrasonography typically takes place after week 16). Weeks 13 to 16
Between weeks 13 and 16, the baby begins to move with regularity. Lanugo, a fine, downy hair, begins to grow on the head. Meconium, a thick, dark green waste substance, is produced in the fetus' bowels and remains there (in most cases) until after birth. Weeks 17 to 20
Week 17 to week 20 is a period of rapid growth for the fetus. It begins to accumulate a layer of fat underneath its skin and starts to progress through somewhat regular intervals of wakefulness and sleep. Increased fetal movement is likely to become apparent, in the form of a fluttering sensation in the mother's abdomen. During this period, the sex of the baby can be discovered via ultrasonography.

Its eyelids close during this period and do not open again until around the 7th month of development in the womb. The ears begin to take their final shape and tooth buds appear. The fetus' genitals are clearly differentiated at this point and may even be visible via ultrasound as early as week 12 (although sex prediction ultrasonography typically takes place after week 16). Weeks 13 to 16
Between weeks 13 and 16, the baby begins to move with regularity. Lanugo, a fine, downy hair, begins to grow on the head. Meconium, a thick, dark green waste substance, is produced in the fetus' bowels and remains there (in most cases) until after birth. Weeks 17 to 20
Week 17 to week 20 is a period of rapid growth for the fetus. It begins to accumulate a layer of fat underneath its skin and starts to progress through somewhat regular intervals of wakefulness and sleep. Increased fetal movement is likely to become apparent, in the form of a fluttering sensation in the mother's abdomen. During this period, the sex of the baby can be discovered via ultrasonography.

Fetal Development: From Insemination to Birth - Pregnancy Center - Everyday Health
What's Going On in There During Pregnancy?
Insemination – the First Step in Pregnancy
Implantation of the Fertilized Egg
The Timeline of Pregnancy
5 Weeks Into Pregnancy: Fetal Development
8 Weeks Into Pregnancy: Fetal Development
12 Weeks Into Pregnancy: Fetal Development
16 Weeks Into Pregnancy: Fetal Development
20 Weeks Into Pregnancy: Fetal Development
24 Weeks Into Pregnancy: Fetal Development
32 Weeks Into Pregnancy: Fetal Development
36 Weeks Into Pregnancy: Fetal Development
37 Weeks to Childbirth
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 12 Weeks Into Pregnancy: Fetal Development
The fetus' face is now well formed, and the liver is actively making red blood cells. The arms and leg buds have now become longer and are recognizable limbs. Genitals appear to differentiate the sex of the fetus, which is now able to make a little fist. The head makes up about half of its body size and the fetus will close its eyes now until about week 28. 16 Weeks Into Pregnancy: Fetal Development
At 16 weeks you can almost see through the fetal skin, and a very fine growth of hair called lanugo is forming on the head. Muscles and bones are coming together to form the skeletal system. The fetus starts to move and make sucking motions with its mouth. The liver and pancreas have formed, and the intestines have started to make the first bowel movement, called the meconium.

Fetal Development: From Insemination to Birth - Pregnancy Center - Everyday Health

What's Going On in There During Pregnancy?
Insemination – the First Step in Pregnancy
Implantation of the Fertilized Egg
The Timeline of Pregnancy
5 Weeks Into Pregnancy: Fetal Development
8 Weeks Into Pregnancy: Fetal Development
12 Weeks Into Pregnancy: Fetal Development
16 Weeks Into Pregnancy: Fetal Development
20 Weeks Into Pregnancy: Fetal Development
24 Weeks Into Pregnancy: Fetal Development
32 Weeks Into Pregnancy: Fetal Development
36 Weeks Into Pregnancy: Fetal Development
37 Weeks to Childbirth
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12 Weeks Into Pregnancy: Fetal Development
The fetus' face is now well formed, and the liver is actively making red blood cells. The arms and leg buds have now become longer and are recognizable limbs. Genitals appear to differentiate the sex of the fetus, which is now able to make a little fist. The head makes up about half of its body size and the fetus will close its eyes now until about week 28. 16 Weeks Into Pregnancy: Fetal Development
At 16 weeks you can almost see through the fetal skin, and a very fine growth of hair called lanugo is forming on the head. Muscles and bones are coming together to form the skeletal system. The fetus starts to move and make sucking motions with its mouth. The liver and pancreas have formed, and the intestines have started to make the first bowel movement, called the meconium.

First Trimester | Children's Hospital of Philadelphia First Trimester
First Trimester
The first prenatal visit
What to expect during the first trimester
Fetal development during the first trimester
First trimester growth and development benchmarks
Changes in the mother's body
Next Steps
 Fetal development during the first trimester
The most dramatic changes and development occur during the first trimester. During the first eight weeks, a fetus is called an embryo. The embryo develops rapidly and by the end of the first trimester it becomes a fetus that is fully formed, weighing approximately 1/2 to one ounce and measuring, on average, three to four inches in length. First trimester growth and development benchmarks
Just as each child grows and matures at different rates and at different times, so does that same child as it begins its life in the womb. The chart provided below provides benchmarks for most normal pregnancies. However, each fetus develops differently. By the end of four weeks
All major systems and organs begin to form
The embryo looks like a tadpole
The neural tube (which becomes the brain and spinal cord), the digestive system, and the heart and circulatory system begin to form
The beginnings of the eyes and ears are developing
Tiny limb buds appear (which will develop into arms and legs)
The heart is beating
By the end of eight weeks
All major body systems continue to develop and function, including the circulatory, nervous, digestive, and urinary systems
The embryo is taking on a human shape, although the head is larger in proportion to the rest of the body
The mouth is developing tooth buds (which will become baby teeth)
The eyes, nose, mouth, and ears are becoming more distinct
The arms and legs are clearly visible
The fingers and toes are still webbed but can be clearly distinguished
The main organs continue to develop and you can hear the baby's heartbeat using an instrument called a Doppler
The bones begin to develop and the nose and jaws are rapidly developing
The embryo is in constant motion but cannot be felt by the mother
From embryo to fetus
After eight weeks, the embryo is now referred to as a fetus (which means offspring). Although the fetus is only 1 to 1 1/2 inches long at this point, all major organs and systems have been formed. During weeks nine-12
The external genital organs are developed
Fingernails and toenails appear
Eyelids are formed
Fetal movement increases
The arms and legs are fully formed
The voice box (larynx) begins to form in the trachea
The fetus is most vulnerable during the first 12 weeks. During this period of time, all of the major organs and body systems are forming and can be damaged if the fetus is exposed to drugs, German measles, radiation, tobacco, and chemical and toxic substances.

First Trimester | Children's Hospital of Philadelphia

First Trimester
First Trimester
The first prenatal visit
What to expect during the first trimester
Fetal development during the first trimester
First trimester growth and development benchmarks
Changes in the mother's body
Next Steps

Infants Remembered In Silence (IRIS) - Resources - Fetal Development Conception - 40 Weeks
 Week 11

Starting with this week, the baby is now called a fetus. The most critical part of the baby's development is over. This is a period of rapid growth, and the baby is about an inch or so in length at the beginning of the week and will be about 2 inches by the end of the week. The baby's head is about half its length. The eyelids will fuse shut, and the irises will begin to develop. Sometime during this week or the next week, blood will begin to circulate between the baby and uterus and the placenta starts to function. Week 12

By this point, nearly all of the organs and structures of the fetus are formed. They will continue to grow and develop until delivery. Fingers and toes have separated and hair and nails begin to grow. The genitals begin to take on their gender characteristics.

Week 11

Starting with this week, the baby is now called a fetus. The most critical part of the baby's development is over. This is a period of rapid growth, and the baby is about an inch or so in length at the beginning of the week and will be about 2 inches by the end of the week. The baby's head is about half its length. The eyelids will fuse shut, and the irises will begin to develop. Sometime during this week or the next week, blood will begin to circulate between the baby and uterus and the placenta starts to function. Week 12

By this point, nearly all of the organs and structures of the fetus are formed. They will continue to grow and develop until delivery. Fingers and toes have separated and hair and nails begin to grow. The genitals begin to take on their gender characteristics.

23.4: Fetal Stage - Biology LibreTexts 23.4: Fetal Stage
23.4: Fetal Stage
Hello, Baby
Defining the Fetal Stage
Fetal Development
Weeks 9 to 15
Weeks 16 to 26
Weeks 27 to 38
Fetal Circulation
Prenatal Circulation
Postnatal Circulation
Birth Weight
Viability of the Fetus
Explore More
Attributions
 The fetus is very active. This is the result of uncontrolled movements and twitches that occur as the muscles, brain, and nervous pathways develop. The fetus may move its limb, make a fist with its fingers, and make sucking motions with its mouth. Generally, brain activity can be detected during these early weeks of the fetal stage. Weeks 16 to 26
Many important changes occur in the fetus during weeks 16 to 26 after fertilization. Some of the specific developments that occur during weeks 16 to 26 include the following. The brain and sensory nerves develop to the point that the fetus has a sense of touch. This may lead to the fetus stroking its face, touching its limbs, and even sucking its thumb. The eyes and ears continue to develop. The eyes move to a forward-facing position, and the retinas develop.

23.4: Fetal Stage - Biology LibreTexts

23.4: Fetal Stage
23.4: Fetal Stage
Hello, Baby
Defining the Fetal Stage
Fetal Development
Weeks 9 to 15
Weeks 16 to 26
Weeks 27 to 38
Fetal Circulation
Prenatal Circulation
Postnatal Circulation
Birth Weight
Viability of the Fetus
Explore More
Attributions

The fetus is very active. This is the result of uncontrolled movements and twitches that occur as the muscles, brain, and nervous pathways develop. The fetus may move its limb, make a fist with its fingers, and make sucking motions with its mouth. Generally, brain activity can be detected during these early weeks of the fetal stage. Weeks 16 to 26
Many important changes occur in the fetus during weeks 16 to 26 after fertilization. Some of the specific developments that occur during weeks 16 to 26 include the following. The brain and sensory nerves develop to the point that the fetus has a sense of touch. This may lead to the fetus stroking its face, touching its limbs, and even sucking its thumb. The eyes and ears continue to develop. The eyes move to a forward-facing position, and the retinas develop.

First Trimester The First Trimester
The First Trimester
The first prenatal visit
What to expect during the first trimester
Fetal development during the first trimester
First trimester growth and development benchmarks
Changes in the mother's body
 During the first 8 weeks, a fetus is called an embryo. The embryo develops rapidly and by the end of the first trimester it becomes a fetus that is fully formed, weighing approximately 1/2 to 1 ounce and measuring, on average, 3 to 4 inches in length. First trimester growth and development benchmarks
Just as each child grows and matures at different rates and at different times, so does that same child as it begins its life in the womb. The chart below provides benchmarks for most normal pregnancies. However, each fetus develops differently. By the end of 4 weeks
All major systems and organs begin to form
The embryo looks like a tadpole
The neural tube (which becomes the brain and spinal cord), the digestive system, and the heart and circulatory system begin to form
The beginnings of the eyes and ears are developing
Tiny limb buds appear (which will develop into arms and legs)
The heart is beating
By the end of 8 weeks
All major body systems continue to develop and function, including the circulatory, nervous, digestive, and urinary systems
The embryo is taking on a human shape, although the head is larger in proportion to the rest of the body
The mouth is developing tooth buds (which will become baby teeth)
The eyes, nose, mouth, and ears are becoming more distinct
The arms and legs can be easily seen
The fingers and toes are still webbed, but can be clearly distinguished
The main organs continue to develop and you can hear the baby's heartbeat using an instrument called a Doppler
The bones begin to develop and the nose and jaws are rapidly developing
The embryo is in constant motion but cannot be felt by the mother
From embryo to fetus
After 8 weeks, the embryo is now referred to as a fetus (which means offspring). Although the fetus is only 1 to 1 1/2 inches long at this point, all major organs and systems have been formed. During weeks 9 to 12
The external genital organs are developed
Fingernails and toenails appear
Eyelids are formed
Fetal movement increases
The arms and legs are fully formed
The voice box (larynx) begins to form in the trachea
The fetus is most vulnerable during the first 12 weeks. During this period of time, all of the major organs and body systems are forming and can be damaged if the fetus is exposed to drugs, German measles, radiation, tobacco, and chemical and toxic substances. Even though the organs and body systems are fully formed by the end of 12 weeks, the fetus cannot survive independently.

First Trimester

The First Trimester
The First Trimester
The first prenatal visit
What to expect during the first trimester
Fetal development during the first trimester
First trimester growth and development benchmarks
Changes in the mother's body

Brain Development of Fetus - Bodytomy Brain Development of Fetus
Brain Development of Fetus
Did You Know ?
Brain Development Timeline
Fetal Brain Development Week 1-2 (First Trimester)
Fetal Brain Development Week 3
Fetal Brain Development Week 4
Fetal Brain Development Week 5
Fetal Brain Development Week 6
Fetal Brain Development Week 7
Fetal Brain Development Week 8
Fetal Brain Development Week 9
Fetal Brain Development Week 10
Fetal Brain Development Week 11-14 (Second Trimester)
Fetal Brain Development Week 15
Fetal Brain Development Week 16
Fetal Brain Development Week 17
Fetal Brain Development Week 18
Fetal Brain Development Week 19
Fetal Brain Development Week 20
Fetal Brain Development Week 21
Fetal Brain Development Week 22
Fetal Brain Development Week 23
Fetal Brain Development Week 24
Fetal Brain Development Week 25
Fetal Brain Development Week 26
Fetal Brain Development Week 27
Fetal Brain Development Week 28 – 40 (Third Trimester)
Brain Development Issues
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 The eyelids and ears are developed and the embryo is now a Fetus. Fetal Brain Development Week 11-14 (Second Trimester)
The spinal cord is clearly defined and the spinal nerves start to stretch out from the spinal cord. This week sees the completion of the first trimester. The sex of the baby can be determined in this period. The heart, liver, spleen and many other organs are already functioning. By this stage, the baby is taking plenty of nourishment through the placenta. The fetus also begins its practice of breathing, inhaling, and exhaling. The eyelids will close and not open until the 28th week. Fetal Brain Development Week 15
The baby’s torso is now growing rapidly and it is completely covered with lanugo; fine hair that protects the skin.

Brain Development of Fetus - Bodytomy

Brain Development of Fetus
Brain Development of Fetus
Did You Know ?
Brain Development Timeline
Fetal Brain Development Week 1-2 (First Trimester)
Fetal Brain Development Week 3
Fetal Brain Development Week 4
Fetal Brain Development Week 5
Fetal Brain Development Week 6
Fetal Brain Development Week 7
Fetal Brain Development Week 8
Fetal Brain Development Week 9
Fetal Brain Development Week 10
Fetal Brain Development Week 11-14 (Second Trimester)
Fetal Brain Development Week 15
Fetal Brain Development Week 16
Fetal Brain Development Week 17
Fetal Brain Development Week 18
Fetal Brain Development Week 19
Fetal Brain Development Week 20
Fetal Brain Development Week 21
Fetal Brain Development Week 22
Fetal Brain Development Week 23
Fetal Brain Development Week 24
Fetal Brain Development Week 25
Fetal Brain Development Week 26
Fetal Brain Development Week 27
Fetal Brain Development Week 28 – 40 (Third Trimester)
Brain Development Issues
Alcohol and Drugs
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Mental, Physical or Sexual Abuse
Did You Know ?
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The eyelids and ears are developed and the embryo is now a Fetus. Fetal Brain Development Week 11-14 (Second Trimester)
The spinal cord is clearly defined and the spinal nerves start to stretch out from the spinal cord. This week sees the completion of the first trimester. The sex of the baby can be determined in this period. The heart, liver, spleen and many other organs are already functioning. By this stage, the baby is taking plenty of nourishment through the placenta. The fetus also begins its practice of breathing, inhaling, and exhaling. The eyelids will close and not open until the 28th week. Fetal Brain Development Week 15
The baby’s torso is now growing rapidly and it is completely covered with lanugo; fine hair that protects the skin.

Brain Development of Fetus - Bodytomy Brain Development of Fetus
Brain Development of Fetus
Did You Know ?
Brain Development Timeline
Fetal Brain Development Week 1-2 (First Trimester)
Fetal Brain Development Week 3
Fetal Brain Development Week 4
Fetal Brain Development Week 5
Fetal Brain Development Week 6
Fetal Brain Development Week 7
Fetal Brain Development Week 8
Fetal Brain Development Week 9
Fetal Brain Development Week 10
Fetal Brain Development Week 11-14 (Second Trimester)
Fetal Brain Development Week 15
Fetal Brain Development Week 16
Fetal Brain Development Week 17
Fetal Brain Development Week 18
Fetal Brain Development Week 19
Fetal Brain Development Week 20
Fetal Brain Development Week 21
Fetal Brain Development Week 22
Fetal Brain Development Week 23
Fetal Brain Development Week 24
Fetal Brain Development Week 25
Fetal Brain Development Week 26
Fetal Brain Development Week 27
Fetal Brain Development Week 28 – 40 (Third Trimester)
Brain Development Issues
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 By this stage, the baby is taking plenty of nourishment through the placenta. The fetus also begins its practice of breathing, inhaling, and exhaling. The eyelids will close and not open until the 28th week. Fetal Brain Development Week 15
The baby’s torso is now growing rapidly and it is completely covered with lanugo; fine hair that protects the skin. The sense of hearing also sharpens at this stage. The pituitary gland is well developed. Fetal Brain Development Week 16
The baby makes its presence known by pulling and tugging on the umbilical cord. The cerebrum is in a further stage of development. Fetal Brain Development Week 17
At this stage, the uterus begins to expand, to give more room to the baby.

Brain Development of Fetus - Bodytomy

By this stage, the baby is taking plenty of nourishment through the placenta. The fetus also begins its practice of breathing, inhaling, and exhaling. The eyelids will close and not open until the 28th week. Fetal Brain Development Week 15
The baby’s torso is now growing rapidly and it is completely covered with lanugo; fine hair that protects the skin. The sense of hearing also sharpens at this stage. The pituitary gland is well developed. Fetal Brain Development Week 16
The baby makes its presence known by pulling and tugging on the umbilical cord. The cerebrum is in a further stage of development. Fetal Brain Development Week 17
At this stage, the uterus begins to expand, to give more room to the baby.

The First Trimester The First Trimester
The First Trimester
The First Trimester (Weeks 1–12)
 A baby starts out as a few cells (called an "embryo" until it reaches its eighth week, and thereafter a "fetus"), and proceeds to develop the basis for all of the mechanisms it will need within the first trimester. Development begins when the fertilized egg attaches itself to the wall of the uterus in a process called "implantation". If all goes well, the fetus will be approximately 6 to 7.5 cm in length, and weigh a little over 1 ounce by the end of the first trimester. Some important developments that occur during this stage include: The development of the placenta and umbilical cord. These structures are important for bringing nutrients from the mother to the fetus, and for removing waste products from the fetus back to the mother's body. The development of the amniotic sac, a fluid-filled membrane that cushions the developing fetus. The development of all major organs. The heart begins to beat on or around the 25th day after conception. The development of the neural tube, which goes on to form the brain and spinal cord.

The First Trimester

The First Trimester
The First Trimester
The First Trimester (Weeks 1–12)

A baby starts out as a few cells (called an "embryo" until it reaches its eighth week, and thereafter a "fetus"), and proceeds to develop the basis for all of the mechanisms it will need within the first trimester. Development begins when the fertilized egg attaches itself to the wall of the uterus in a process called "implantation". If all goes well, the fetus will be approximately 6 to 7.5 cm in length, and weigh a little over 1 ounce by the end of the first trimester. Some important developments that occur during this stage include: The development of the placenta and umbilical cord. These structures are important for bringing nutrients from the mother to the fetus, and for removing waste products from the fetus back to the mother's body. The development of the amniotic sac, a fluid-filled membrane that cushions the developing fetus. The development of all major organs. The heart begins to beat on or around the 25th day after conception. The development of the neural tube, which goes on to form the brain and spinal cord.

Brain Development of Fetus - Bodytomy Brain Development of Fetus
Brain Development of Fetus
Did You Know ?
Brain Development Timeline
Fetal Brain Development Week 1-2 (First Trimester)
Fetal Brain Development Week 3
Fetal Brain Development Week 4
Fetal Brain Development Week 5
Fetal Brain Development Week 6
Fetal Brain Development Week 7
Fetal Brain Development Week 8
Fetal Brain Development Week 9
Fetal Brain Development Week 10
Fetal Brain Development Week 11-14 (Second Trimester)
Fetal Brain Development Week 15
Fetal Brain Development Week 16
Fetal Brain Development Week 17
Fetal Brain Development Week 18
Fetal Brain Development Week 19
Fetal Brain Development Week 20
Fetal Brain Development Week 21
Fetal Brain Development Week 22
Fetal Brain Development Week 23
Fetal Brain Development Week 24
Fetal Brain Development Week 25
Fetal Brain Development Week 26
Fetal Brain Development Week 27
Fetal Brain Development Week 28 – 40 (Third Trimester)
Brain Development Issues
Alcohol and Drugs
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Mental, Physical or Sexual Abuse
Did You Know ?
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 The heart too starts to beat with twice the rate of the mother. Fetal Brain Development Week 6
This week sees the formation of the brain hemispheres and also some wave activity. The neural tube that connects the brain and spinal cord also closes in this duration. The formation of the Pituitary, Thymus and Parathyroid begins too. Fetal Brain Development Week 7
By this week, the brain is growing at a rapid rate. The eyelids and ears have started to form and also the genital area. Fetal Brain Development Week 8
In this week, the head is quite large, as compared to the rest of the body. The development of the hind brain, responsible for regulating heartbeat, breathing and all concerned muscle movements also begins now. Fetal Brain Development Week 9
The nervous system, by now, is quite developed for proper functioning. The genital region for both the sexes look alike.

Brain Development of Fetus - Bodytomy

The heart too starts to beat with twice the rate of the mother. Fetal Brain Development Week 6
This week sees the formation of the brain hemispheres and also some wave activity. The neural tube that connects the brain and spinal cord also closes in this duration. The formation of the Pituitary, Thymus and Parathyroid begins too. Fetal Brain Development Week 7
By this week, the brain is growing at a rapid rate. The eyelids and ears have started to form and also the genital area. Fetal Brain Development Week 8
In this week, the head is quite large, as compared to the rest of the body. The development of the hind brain, responsible for regulating heartbeat, breathing and all concerned muscle movements also begins now. Fetal Brain Development Week 9
The nervous system, by now, is quite developed for proper functioning. The genital region for both the sexes look alike.

23.4: Fetal Stage - Biology LibreTexts 23.4: Fetal Stage
23.4: Fetal Stage
Hello, Baby
Defining the Fetal Stage
Fetal Development
Weeks 9 to 15
Weeks 16 to 26
Weeks 27 to 38
Fetal Circulation
Prenatal Circulation
Postnatal Circulation
Birth Weight
Viability of the Fetus
Explore More
Attributions
 A model of a fetus at 38 weeks after fertilization. Weeks 9 to 15
During weeks 9 to 15, the fetus’s reproductive organs develop rapidly. The external genitals of male and female fetuses are rather similar in appearance at first, but they will be clearly differentiated by week 12. At that point, the biological sex of the fetus can be determined with almost 100 percent accuracy using obstetric ultrasound. Figure 23.4. 4 s shows a fetus at 11 weeks. Other developments that usually occur in the fetus during weeks 9 to 15 after fertilization include the following: Facial development continues. The eyelids form, the ears move toward their final position on the sides of the head, and tooth buds appear. Fine, colorless hair called lanugo starts to grow on the fetus’s face.

23.4: Fetal Stage - Biology LibreTexts

A model of a fetus at 38 weeks after fertilization. Weeks 9 to 15
During weeks 9 to 15, the fetus’s reproductive organs develop rapidly. The external genitals of male and female fetuses are rather similar in appearance at first, but they will be clearly differentiated by week 12. At that point, the biological sex of the fetus can be determined with almost 100 percent accuracy using obstetric ultrasound. Figure 23.4. 4 s shows a fetus at 11 weeks. Other developments that usually occur in the fetus during weeks 9 to 15 after fertilization include the following: Facial development continues. The eyelids form, the ears move toward their final position on the sides of the head, and tooth buds appear. Fine, colorless hair called lanugo starts to grow on the fetus’s face.

First Trimester | Children's Hospital of Philadelphia First Trimester
First Trimester
The first prenatal visit
What to expect during the first trimester
Fetal development during the first trimester
First trimester growth and development benchmarks
Changes in the mother's body
Next Steps
 However, each fetus develops differently. By the end of four weeks
All major systems and organs begin to form
The embryo looks like a tadpole
The neural tube (which becomes the brain and spinal cord), the digestive system, and the heart and circulatory system begin to form
The beginnings of the eyes and ears are developing
Tiny limb buds appear (which will develop into arms and legs)
The heart is beating
By the end of eight weeks
All major body systems continue to develop and function, including the circulatory, nervous, digestive, and urinary systems
The embryo is taking on a human shape, although the head is larger in proportion to the rest of the body
The mouth is developing tooth buds (which will become baby teeth)
The eyes, nose, mouth, and ears are becoming more distinct
The arms and legs are clearly visible
The fingers and toes are still webbed but can be clearly distinguished
The main organs continue to develop and you can hear the baby's heartbeat using an instrument called a Doppler
The bones begin to develop and the nose and jaws are rapidly developing
The embryo is in constant motion but cannot be felt by the mother
From embryo to fetus
After eight weeks, the embryo is now referred to as a fetus (which means offspring). Although the fetus is only 1 to 1 1/2 inches long at this point, all major organs and systems have been formed. During weeks nine-12
The external genital organs are developed
Fingernails and toenails appear
Eyelids are formed
Fetal movement increases
The arms and legs are fully formed
The voice box (larynx) begins to form in the trachea
The fetus is most vulnerable during the first 12 weeks. During this period of time, all of the major organs and body systems are forming and can be damaged if the fetus is exposed to drugs, German measles, radiation, tobacco, and chemical and toxic substances. Even though the organs and body systems are fully formed by the end of 12 weeks, the fetus cannot survive independently. Changes in the mother's body
During pregnancy, many changes are also occurring in the mother-to-be's body. Women experience these changes differently. Some symptoms of pregnancy continue for several weeks or months, while others are only experienced for a short period of time. Some women experience many symptoms, while other women experience only a few or none at all.

23.4: Fetal Stage - Biology LibreTexts 23.4: Fetal Stage
23.4: Fetal Stage
Hello, Baby
Defining the Fetal Stage
Fetal Development
Weeks 9 to 15
Weeks 16 to 26
Weeks 27 to 38
Fetal Circulation
Prenatal Circulation
Postnatal Circulation
Birth Weight
Viability of the Fetus
Explore More
Attributions
 The fetus’s movements become more forceful, and the movements stimulate further development of the muscles. The intestines develop sufficiently that small amounts of sugars can be absorbed from the amniotic fluid that is swallowed. Virtually all of the fetus’s nutrients, however, still come from the mother’s blood via the placenta. The fetus develops a thick waxy coating called vernix. This coating protects the fetus’s skin from becoming chapped or irritated by amniotic fluid. Weeks 27 to 38
During weeks 27 to 38 after fertilization, the bones of the fetus complete their development. The fetus also grows rapidly during these final weeks, and its body fat increases substantially. Its formerly wrinkled skin starts to plump out as layers of subcutaneous fat are deposited. Additional changes that occur in the fetus during weeks 27 to 38 include the following: The fetus’s head hair grows thicker and coarser while the lanugo is shed.

23.4: Fetal Stage - Biology LibreTexts

The fetus’s movements become more forceful, and the movements stimulate further development of the muscles. The intestines develop sufficiently that small amounts of sugars can be absorbed from the amniotic fluid that is swallowed. Virtually all of the fetus’s nutrients, however, still come from the mother’s blood via the placenta. The fetus develops a thick waxy coating called vernix. This coating protects the fetus’s skin from becoming chapped or irritated by amniotic fluid. Weeks 27 to 38
During weeks 27 to 38 after fertilization, the bones of the fetus complete their development. The fetus also grows rapidly during these final weeks, and its body fat increases substantially. Its formerly wrinkled skin starts to plump out as layers of subcutaneous fat are deposited. Additional changes that occur in the fetus during weeks 27 to 38 include the following: The fetus’s head hair grows thicker and coarser while the lanugo is shed.

Summa Health | First Trimester 1st Trimester
1st Trimester
What to expect
Fetal development
Development benchmarks and growth
Changes in the mother's body
The first prenatal visit
 During the first trimester, both the mother's body and the fetus are changing rapidly. Fetal development
The most dramatic changes and development occur during the first trimester. During the first eight weeks, a fetus is called an embryo. The embryo develops rapidly and by the end of the first trimester it becomes a fetus that is fully formed, weighing approximately 1/2 to one ounce and measuring, on average, three to four inches in length. Development benchmarks and growth
Just as each child grows and matures at different rates and at different times, so does that same child as it begins its life in the womb. The chart provided below provides benchmarks for most normal pregnancies. However, each fetus develops differently. By the end of four weeks
All major systems and organs begin to form
The embryo looks like a tadpole
The neural tube (which becomes the brain and spinal cord), the digestive system, and the heart and circulatory system begin to form
The beginnings of the eyes and ears are developing
Tiny limb buds appear (which will develop into arms and legs)
The heart is beating
By the end of eight weeks
All major body systems continue to develop and function, including the circulatory, nervous, digestive, and urinary systems
The embryo is taking on a human shape, although the head is larger in proportion to the rest of the body
The mouth is developing tooth buds (which will become baby teeth)
The eyes, nose, mouth, and ears are becoming more distinct
The arms and legs are clearly visible
The fingers and toes are still webbed but can be clearly distinguished
The main organs continue to develop and you can hear the baby's heartbeat using an instrument called a Doppler
The bones begin to develop and the nose and jaws are rapidly developing
The embryo is in constant motion but cannot be felt by the mother
From embryo to fetus
After eight weeks, the embryo is now referred to as a fetus (which means offspring). Although the fetus is only 1 to 1 1/2 inches long at this point, all major organs and systems have been formed. During weeks nine-12
The external genital organs are developed
Fingernails and toenails appear
Eyelids are formed
Fetal movement increases
The arms and legs are fully formed
The voice box (larynx) begins to form in the trachea
The fetus is most vulnerable during the first 12 weeks.

Summa Health | First Trimester

1st Trimester
1st Trimester
What to expect
Fetal development
Development benchmarks and growth
Changes in the mother's body
The first prenatal visit

Week 7 - Month 2 Arms and legs begin to grow Fetal development pregnancy information over weeks months trimesters Week Seven: Arms and legs begin to grow
Weeks, Months and Trimesters Guides
Week Seven: Arms and legs begin to grow
Week By Week Pregnancy Calendar
 The embryo's arms and legs begin to grow from buds at each side. At first the hands and feet are shaped like paddles, but the fingers soon take shape. Lenses of the eyes appear - You would notice your baby's appearance is becoming increasing like a newborn's. Brain is growing well - Did you know that over the course of the remaining months that your baby's brain will develop over 100 billion neurons? This is just the beginning. First trimester Week by week: ultrasound scan pictures: Week 7
<<< Week 6 | Month 2 | Week 8 >>>
Enjoy - First class FREE shipping anywhere in the world. Boy or Girl? Gender prediction test

Week By Week Pregnancy Calendar

First Trimester
Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7
Week 8 Week 9 Week 10 Week 11 Week 12 Week 13
Second Trimester
Week 14 Week 15 Week 16 Week 17 Week 18 Week 19 Week 20
Week 21 Week 22 Week 23 Week 24 Week 25 Week 26
Third Trimester
Week 27 Week 28 Week 29 Week 30 Week 31 Week 32 Week 33
Week 34 Week 35 Week 36 Week 37 Week 38 Week 39 Week 40

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Week 7 - Month 2 Arms and legs begin to grow Fetal development pregnancy information over weeks months trimesters

Week Seven: Arms and legs begin to grow
Weeks, Months and Trimesters Guides
Week Seven: Arms and legs begin to grow
Week By Week Pregnancy Calendar

The embryo's arms and legs begin to grow from buds at each side. At first the hands and feet are shaped like paddles, but the fingers soon take shape. Lenses of the eyes appear - You would notice your baby's appearance is becoming increasing like a newborn's. Brain is growing well - Did you know that over the course of the remaining months that your baby's brain will develop over 100 billion neurons? This is just the beginning. First trimester Week by week: ultrasound scan pictures: Week 7
<<< Week 6 | Month 2 | Week 8 >>>
Enjoy - First class FREE shipping anywhere in the world. Boy or Girl? Gender prediction test

Week By Week Pregnancy Calendar

First Trimester
Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7
Week 8 Week 9 Week 10 Week 11 Week 12 Week 13
Second Trimester
Week 14 Week 15 Week 16 Week 17 Week 18 Week 19 Week 20
Week 21 Week 22 Week 23 Week 24 Week 25 Week 26
Third Trimester
Week 27 Week 28 Week 29 Week 30 Week 31 Week 32 Week 33
Week 34 Week 35 Week 36 Week 37 Week 38 Week 39 Week 40

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Embryo vs. Fetus: What’s the Difference? Embryo vs. Fetus: Fetal Development Week-by-Week
Embryo vs. Fetus: Fetal Development Week-by-Week
What’s a Zygote?
Embryo vs. Fetus
The First 10 Weeks of Pregnancy
Weeks 1 and 2: Preparation
Week 3: Ovulation
Week 4: Implantation
Week 5: Embryonic Period Starts
Week 6
Week 7
Week 8
Week 9
Week 10: Embryonic Period Ends
Week 11 and Beyond
Late First Trimester
Second Trimester
Third Trimester
Miscarriage
Your First Prenatal Appointment: What to Expect
The Takeaway
 Week 11 and Beyond
Congratulations, you’ve graduated from having an embryo to a fetus. From week 11 onward, your baby will continue to develop and grow until the end of your pregnancy. Here’s more of what they’re up to. Late First Trimester
Your baby’s development is still in high gear for the rest of the first trimester. They’ve even started to grow fingernails. Their face has taken on more human characteristics. By the end of week 12, your baby will be 2 1/2 inches from crown to rump, and weigh around 1/2 ounce. Second Trimester
Week 13 marks the start of the second trimester. During this stage, your fetus is looking and operating more like a real baby. Early on, their sex organs are developing, their bones are getting stronger, and fat is starting to accumulate on their body.

Week 11 and Beyond
Congratulations, you’ve graduated from having an embryo to a fetus. From week 11 onward, your baby will continue to develop and grow until the end of your pregnancy. Here’s more of what they’re up to. Late First Trimester
Your baby’s development is still in high gear for the rest of the first trimester. They’ve even started to grow fingernails. Their face has taken on more human characteristics. By the end of week 12, your baby will be 2 1/2 inches from crown to rump, and weigh around 1/2 ounce. Second Trimester
Week 13 marks the start of the second trimester. During this stage, your fetus is looking and operating more like a real baby. Early on, their sex organs are developing, their bones are getting stronger, and fat is starting to accumulate on their body.

Fetal Development in 25 Weeks Pregnant Fetal Development in 25 Weeks Pregnant
Fetal Development in 25 Weeks Pregnant
Size
Baby’s brain
Skin
Blood vessels
Respiratory system
Reproductive organs
Hands
Movements
 Here is the fetal development in 25th week of pregnancy. Size
During this week, your baby weighs about 1 and half pounds and about 13 inches long. Baby’s brain
Your baby’s brain is rapidly growing and the brain cells are beginning to mature. Your baby’s brain cortex is forming into layers. The cerebral cortex is the most elaborate structure of the brain which gives us the ability to plan, feel, and think in complex ways. Most of the process is still regulated by other areas of brain that formed much earlier. Skin
Your baby’s skin is still pale, thin, and wrinkled, but your baby is becoming little plumper every day because of the continuous addition of the fat and muscle. Blood vessels
During this stage, small blood vessels known as capillaries are beginning to form under the baby’s skin and these will provide the skin a pink shade. Respiratory system
Though your baby’s lungs are developing faster, the baby probably requires a little help in breathing if he/she were to born in this period. Baby’s respiratory system develops continuously.

Fetal Development in 25 Weeks Pregnant

Fetal Development in 25 Weeks Pregnant
Fetal Development in 25 Weeks Pregnant
Size
Baby’s brain
Skin
Blood vessels
Respiratory system
Reproductive organs
Hands
Movements

Here is the fetal development in 25th week of pregnancy. Size
During this week, your baby weighs about 1 and half pounds and about 13 inches long. Baby’s brain
Your baby’s brain is rapidly growing and the brain cells are beginning to mature. Your baby’s brain cortex is forming into layers. The cerebral cortex is the most elaborate structure of the brain which gives us the ability to plan, feel, and think in complex ways. Most of the process is still regulated by other areas of brain that formed much earlier. Skin
Your baby’s skin is still pale, thin, and wrinkled, but your baby is becoming little plumper every day because of the continuous addition of the fat and muscle. Blood vessels
During this stage, small blood vessels known as capillaries are beginning to form under the baby’s skin and these will provide the skin a pink shade. Respiratory system
Though your baby’s lungs are developing faster, the baby probably requires a little help in breathing if he/she were to born in this period. Baby’s respiratory system develops continuously.

Timeline of human prenatal development - Wikipedia Timeline of human prenatal development
Timeline of human prenatal development
Contents
Changes by weeks of gestation
Gestational age vs. embryonic age
Week 3
Week 4
Week 5
Week 6
Week 7
Week 8
Week 9
Changes by weeks of gestation
Weeks 10 to 12
Weeks 13 to 16
Week 21
Week 23
Week 26
Week 31
Week 35
Weeks 36 to 40
References
 A fine hair called lanugo develops on the head. Fetal skin is almost transparent. More muscle tissue and bones have developed, and the bones become harder. The fetus makes active movements. Sucking motions are made with the mouth. Meconium is made in the intestinal tract. The liver and pancreas produce fluid secretions. From week 13, sex prediction by obstetric ultrasonography is almost 100% accurate. At week 15, main development of external genitalia is finished. Fetus at 18 weeks after fertilization.

Timeline of human prenatal development - Wikipedia

Timeline of human prenatal development
Timeline of human prenatal development
Contents
Changes by weeks of gestation
Gestational age vs. embryonic age
Week 3
Week 4
Week 5
Week 6
Week 7
Week 8
Week 9
Changes by weeks of gestation
Weeks 10 to 12
Weeks 13 to 16
Week 21
Week 23
Week 26
Week 31
Week 35
Weeks 36 to 40
References

A fine hair called lanugo develops on the head. Fetal skin is almost transparent. More muscle tissue and bones have developed, and the bones become harder. The fetus makes active movements. Sucking motions are made with the mouth. Meconium is made in the intestinal tract. The liver and pancreas produce fluid secretions. From week 13, sex prediction by obstetric ultrasonography is almost 100% accurate. At week 15, main development of external genitalia is finished. Fetus at 18 weeks after fertilization.

Summa Health | First Trimester 1st Trimester
1st Trimester
What to expect
Fetal development
Development benchmarks and growth
Changes in the mother's body
The first prenatal visit
 The chart provided below provides benchmarks for most normal pregnancies. However, each fetus develops differently. By the end of four weeks
All major systems and organs begin to form
The embryo looks like a tadpole
The neural tube (which becomes the brain and spinal cord), the digestive system, and the heart and circulatory system begin to form
The beginnings of the eyes and ears are developing
Tiny limb buds appear (which will develop into arms and legs)
The heart is beating
By the end of eight weeks
All major body systems continue to develop and function, including the circulatory, nervous, digestive, and urinary systems
The embryo is taking on a human shape, although the head is larger in proportion to the rest of the body
The mouth is developing tooth buds (which will become baby teeth)
The eyes, nose, mouth, and ears are becoming more distinct
The arms and legs are clearly visible
The fingers and toes are still webbed but can be clearly distinguished
The main organs continue to develop and you can hear the baby's heartbeat using an instrument called a Doppler
The bones begin to develop and the nose and jaws are rapidly developing
The embryo is in constant motion but cannot be felt by the mother
From embryo to fetus
After eight weeks, the embryo is now referred to as a fetus (which means offspring). Although the fetus is only 1 to 1 1/2 inches long at this point, all major organs and systems have been formed. During weeks nine-12
The external genital organs are developed
Fingernails and toenails appear
Eyelids are formed
Fetal movement increases
The arms and legs are fully formed
The voice box (larynx) begins to form in the trachea
The fetus is most vulnerable during the first 12 weeks. During this period of time, all of the major organs and body systems are forming and can be damaged if the fetus is exposed to drugs, German measles, radiation, tobacco, and chemical and toxic substances. Even though the organs and body systems are fully formed by the end of 12 weeks, the fetus cannot survive independently. Changes in the mother's body
During pregnancy, many changes are also occurring in the mother-to-be's body. Women experience these changes differently. Some symptoms of pregnancy continue for several weeks or months, while others are only experienced for a short period of time.

Summa Health | First Trimester

Pregnancy: 0-8 weeks Pregnancy: 0-8 weeks
Pregnancy: 0-8 weeks
Weeks 0 to 4
Week 4
Week 5
Week 6
Week 7
Week 8
The mother’s body
Sources
Further Reading
Sally Robertson
 Baby Ultrasound early pregnancy 5,6,7,8,9 weeks 3D
Play
Week 7
By week 7, the embryo measures around 10mm and the brain, head and face start to develop rapidly. Nerve cells undergo continued development as the brain and spinal cord begin to take shape. The forehead is large and the lenses of the eyes start to form. The inner ear also starts to develop and the arm buds lengthen and become paddle shaped. These will eventually develop into hands. Week 8
By week 8, the baby is referred to as a fetus. The legs form cartilage and increase in length, although leg parts such as the knees, thigh and toes are not yet distinct. Fingers have started to form, the ears have started to become shell shaped and the eyes are visible. The fetus is still contained within the amniotic sac and receives nutrients from the yolk sac, but the placenta continues to develop and forms structures that will enable it to become attached to the womb. The fetus may now be around 11 to 14mm in length.

Pregnancy: 0-8 weeks

Pregnancy: 0-8 weeks
Pregnancy: 0-8 weeks
Weeks 0 to 4
Week 4
Week 5
Week 6
Week 7
Week 8
The mother’s body
Sources
Further Reading
Sally Robertson

Baby Ultrasound early pregnancy 5,6,7,8,9 weeks 3D
Play
Week 7
By week 7, the embryo measures around 10mm and the brain, head and face start to develop rapidly. Nerve cells undergo continued development as the brain and spinal cord begin to take shape. The forehead is large and the lenses of the eyes start to form. The inner ear also starts to develop and the arm buds lengthen and become paddle shaped. These will eventually develop into hands. Week 8
By week 8, the baby is referred to as a fetus. The legs form cartilage and increase in length, although leg parts such as the knees, thigh and toes are not yet distinct. Fingers have started to form, the ears have started to become shell shaped and the eyes are visible. The fetus is still contained within the amniotic sac and receives nutrients from the yolk sac, but the placenta continues to develop and forms structures that will enable it to become attached to the womb. The fetus may now be around 11 to 14mm in length.

Fetal Development: Your Baby's Journey from Conception to Birth | Parents Your Baby's Journey from Conception to Birth
Your Baby's Journey from Conception to Birth
Discover how your baby grows during your 40 weeks of pregnancy.
1 of 10
Sperm Meets Egg: Weeks 1 to 3 of Pregnancy
2 of 10
An Embryo Forms: Weeks 4 to 8 of Pregnancy
3 of 10
Embryo to Fetus: Weeks 9 to 12 of Pregnancy
4 of 10
Second Trimester Begins: Weeks 13 to 17 of Pregnancy
5 of 10
Feeling Baby Move: Weeks 18 to 21 of Pregnancy
6 of 10
Boy or Girl: How Genetics Determine Your Baby's Gender
7 of 10
Developing Senses: Weeks 22 to 25 of Pregnancy
8 of 10
Sleep Cycles: Weeks 26 to 30 of Pregnancy
9 of 10
Growing Big: Weeks 31 to 34 of Pregnancy
10 of 10
Your Baby Is Almost Here: Week 35 of Pregnancy to Birth
 Weeks 4 to 8 of Pregnancy
Chances are you have no idea you're pregnant yet -- but your body is already hard at work. By the 4th week of your pregnancy, the ball of cells that is developing into your baby is the size of a poppy seed. By the 5th week, the ball of cells resembles a tadpole and is the size of a peppercorn; the development of the brain, spinal cord, and heart are under way, and facial features begin to form. An umbilical cord connects the baby to your body. Watch as the egg undergoes its wondrous transformation to embryo. 2 of 10
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Embryo to Fetus: Weeks 9 to 12 of Pregnancy
At week 9, your baby has graduated from embryo to fetus. It is still too early to determine whether the baby is a boy or girl, but you'll soon feel the jerks felt from baby's hiccups -- one of the earliest moves a fetus makes. Facial features continue to develop and by the end of 10 weeks, Baby has developed 90 percent of the anatomical structure adults have.

Fetal Development: Your Baby's Journey from Conception to Birth | Parents

Your Baby's Journey from Conception to Birth
Your Baby's Journey from Conception to Birth
Discover how your baby grows during your 40 weeks of pregnancy.
1 of 10
Sperm Meets Egg: Weeks 1 to 3 of Pregnancy
2 of 10
An Embryo Forms: Weeks 4 to 8 of Pregnancy
3 of 10
Embryo to Fetus: Weeks 9 to 12 of Pregnancy
4 of 10
Second Trimester Begins: Weeks 13 to 17 of Pregnancy
5 of 10
Feeling Baby Move: Weeks 18 to 21 of Pregnancy
6 of 10
Boy or Girl: How Genetics Determine Your Baby's Gender
7 of 10
Developing Senses: Weeks 22 to 25 of Pregnancy
8 of 10
Sleep Cycles: Weeks 26 to 30 of Pregnancy
9 of 10
Growing Big: Weeks 31 to 34 of Pregnancy
10 of 10
Your Baby Is Almost Here: Week 35 of Pregnancy to Birth

Weeks 4 to 8 of Pregnancy
Chances are you have no idea you're pregnant yet -- but your body is already hard at work. By the 4th week of your pregnancy, the ball of cells that is developing into your baby is the size of a poppy seed. By the 5th week, the ball of cells resembles a tadpole and is the size of a peppercorn; the development of the brain, spinal cord, and heart are under way, and facial features begin to form. An umbilical cord connects the baby to your body. Watch as the egg undergoes its wondrous transformation to embryo. 2 of 10
Applications
View All
3 of 10
Save Pin
ellipsis
More
Facebook Tweet
Mail
Email
iphone
Send Text Message
Embryo to Fetus: Weeks 9 to 12 of Pregnancy
At week 9, your baby has graduated from embryo to fetus. It is still too early to determine whether the baby is a boy or girl, but you'll soon feel the jerks felt from baby's hiccups -- one of the earliest moves a fetus makes. Facial features continue to develop and by the end of 10 weeks, Baby has developed 90 percent of the anatomical structure adults have.

23.4: Fetal Stage - Biology LibreTexts 23.4: Fetal Stage
23.4: Fetal Stage
Hello, Baby
Defining the Fetal Stage
Fetal Development
Weeks 9 to 15
Weeks 16 to 26
Weeks 27 to 38
Fetal Circulation
Prenatal Circulation
Postnatal Circulation
Birth Weight
Viability of the Fetus
Explore More
Attributions
 Weeks 27 to 38
During weeks 27 to 38 after fertilization, the bones of the fetus complete their development. The fetus also grows rapidly during these final weeks, and its body fat increases substantially. Its formerly wrinkled skin starts to plump out as layers of subcutaneous fat are deposited. Additional changes that occur in the fetus during weeks 27 to 38 include the following: The fetus’s head hair grows thicker and coarser while the lanugo is shed. The waxy vernix covering the fetus becomes thicker at first, but most of it will disappear by birth. In preparation for breathing after birth, the fetus will repeatedly mimic breathing by moving the diaphragm. By about week 32, the lungs are likely to be fully developed so the fetus can breathe on its own, should it be born this early. The fetus can not only hear and feel touch, but its eyes can now detect light. In fact, the pupils can constrict and dilate in response to light.

23.4: Fetal Stage - Biology LibreTexts

Weeks 27 to 38
During weeks 27 to 38 after fertilization, the bones of the fetus complete their development. The fetus also grows rapidly during these final weeks, and its body fat increases substantially. Its formerly wrinkled skin starts to plump out as layers of subcutaneous fat are deposited. Additional changes that occur in the fetus during weeks 27 to 38 include the following: The fetus’s head hair grows thicker and coarser while the lanugo is shed. The waxy vernix covering the fetus becomes thicker at first, but most of it will disappear by birth. In preparation for breathing after birth, the fetus will repeatedly mimic breathing by moving the diaphragm. By about week 32, the lungs are likely to be fully developed so the fetus can breathe on its own, should it be born this early. The fetus can not only hear and feel touch, but its eyes can now detect light. In fact, the pupils can constrict and dilate in response to light.

Brain development in fetus | General center | SteadyHealth.com Brain development in fetus
Brain development in fetus
Fetal brain development
Fetal brain development timeline
Sources & Links
 Brain development in fetus | General center | SteadyHealth.com
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Brain development in fetus
1 Comment
by Amanda Kerry — Last updated: 2011-01-25
Fetal brain development
Once a woman conceives a pregnancy, a new life starts. In the first eight weeks, it is just called embryo, while from that week to the end of the pregnancy, it is called fetus. The development of the brain in the fetus includes the development of the brain together with the nervous system and the spinal cord. Fetal brain development timeline
In the first two weeks of pregnancy, the fertilized egg is implanting inside of the uterus. In the third week the heart, the backbone and the brain of the embryo start to form. The further development of the brain continues in the fourth week of the pregnancy when fore, middle and hindbrain begin to be distinguished together with the optical stalk. In the fifth week, the brain continues to develop while the heart with the four chambers formed starts to function. During this week, the embryo gets facial features, as well as arms and legs with the fingers. The brain hemispheres are formed in the sixth week of the pregnancy.

Brain development in fetus | General center | SteadyHealth.com

Brain development in fetus
Brain development in fetus
Fetal brain development
Fetal brain development timeline
Sources & Links

Brain development in fetus | General center | SteadyHealth.com
Home
...
Info Center
General
Brain development in fetus
1 Comment
by Amanda Kerry — Last updated: 2011-01-25
Fetal brain development
Once a woman conceives a pregnancy, a new life starts. In the first eight weeks, it is just called embryo, while from that week to the end of the pregnancy, it is called fetus. The development of the brain in the fetus includes the development of the brain together with the nervous system and the spinal cord. Fetal brain development timeline
In the first two weeks of pregnancy, the fertilized egg is implanting inside of the uterus. In the third week the heart, the backbone and the brain of the embryo start to form. The further development of the brain continues in the fourth week of the pregnancy when fore, middle and hindbrain begin to be distinguished together with the optical stalk. In the fifth week, the brain continues to develop while the heart with the four chambers formed starts to function. During this week, the embryo gets facial features, as well as arms and legs with the fingers. The brain hemispheres are formed in the sixth week of the pregnancy.

29 weeks pregnant: fetal development - BabyCenter India 29 weeks pregnant: fetal development
29 weeks pregnant: fetal development
Inside pregnancy: weeks 28-37
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29 weeks pregnant: fetal development
Your baby's skeleton is hardening. See how your baby is developing at 29 weeks of pregnancy. Your baby's brain is busy developing billions of neurons. Your baby's skeleton is hardening.

29 weeks pregnant: fetal development - BabyCenter India

29 weeks pregnant: fetal development
29 weeks pregnant: fetal development
Inside pregnancy: weeks 28-37
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Track your baby’s development

29 weeks pregnant: fetal development - BabyCenter India
Pregnancy
All Pregnancy Early pregnancy Due date calculator Fetal development
Fetal development week by week
Ultrasound images Fetal development videos Baby movements Pregnancy health Emotional health Boy or girl Garbha sanskar Nutrition & weight gain Pregnancy fitness Fashion and beauty Bonding with your bump Labour and delivery Sleep and dreams Naming your baby Is it normal? Pregnancy safety Pregnancy: is it true...? Work and pregnancy Travel in pregnancy Miscarriage and loss Twins or more Becoming a dad Pregnancy Calendar Videos Slideshows
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Birth clubs I'm pregnant! My pregnancy journal Pregnant with twins or more Baby names See all pregnancy groups
Home Pregnancy Fetal development Fetal development week by week
29 weeks pregnant: fetal development
Your baby's skeleton is hardening. See how your baby is developing at 29 weeks of pregnancy. Your baby's brain is busy developing billions of neurons. Your baby's skeleton is hardening.

Fetal development week by week - BabyCenter Canada Fetal development week by week
Fetal development week by week
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Follow your baby's development from a tiny mass of cells through to a fully-developed baby. Our illustrations show how your baby is growing inside your uterus, while our Inside pregnancy videos take a 3D animated look at a baby from conception to labour and birth. Conception
See what happens inside you during the conception process. Fertilisation
How BabyCentre works out how pregnant you are
Video: Inside pregnancy - a 3D animated look at a baby from weeks one to nine
One month pregnant
Your baby is an embryo consisting of two layers of cells from which all her organs and body parts will develop. 4 weeks pregnant
5 weeks pregnant
6 weeks pregnant
7 weeks pregnant
Twins - 3 weeks pregnant
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Video: Inside pregnancy - weeks 1 to 9
Two months pregnant
Your baby is now about the size of a kidney bean and is constantly moving. He has distinct, slightly webbed fingers. 8 weeks pregnant
9 weeks pregnant
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Twins - 8 weeks pregnant
Twins - 12 weeks pregnant
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Fetal development week by week - BabyCenter Canada

Fetal development week by week
Fetal development week by week
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One month pregnant
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Track your baby’s development

Second Trimester | American Pregnancy Association Second Trimester: Fetal Development
Second Trimester: Fetal Development
Second Trimester Fetal Development Milestones
Weeks 14 thru 16 – Gestational Age (Fetal age – Weeks 12 thru 14):
Weeks 17 thru 20 – Gestational Age (Fetal Age – Weeks 15 thru 18):
Weeks 21 thru 23 – Gestational Age (Fetal Age – Weeks 19 thru 21):
Weeks 24 thru 26 – Gestational Age (Fetal Age – Weeks 22 thru 24)-
Beginning the third trimester:
Want to Know More?
 Second Trimester | American Pregnancy Association
Second Trimester: Fetal Development
The second trimester is from week 13 through 28. For many women the second trimester is the easiest. Morning sickness and fatigue subside leaving your more energetic and feeling like your old self again. Second Trimester Fetal Development Milestones
Weeks 14 thru 16 – Gestational Age (Fetal age – Weeks 12 thru 14): The fetus’s skin is transparent and a fine hair called lanugo begins to form on the head. The fetus begins sucking and swallows bits of amniotic fluid. Fingerprints which individualize each human being have now developed on the tiny fingers of the fetus. Meconium is made in the intestinal tract and will build up to be the baby’s first bowel movement. Flutters may be felt in the mom’s growing abdomen, as the fetus begins to move around more.

Second Trimester | American Pregnancy Association

Second Trimester: Fetal Development
Second Trimester: Fetal Development
Second Trimester Fetal Development Milestones
Weeks 14 thru 16 – Gestational Age (Fetal age – Weeks 12 thru 14):
Weeks 17 thru 20 – Gestational Age (Fetal Age – Weeks 15 thru 18):
Weeks 21 thru 23 – Gestational Age (Fetal Age – Weeks 19 thru 21):
Weeks 24 thru 26 – Gestational Age (Fetal Age – Weeks 22 thru 24)-
Beginning the third trimester:
Want to Know More?

Second Trimester | American Pregnancy Association
Second Trimester: Fetal Development
The second trimester is from week 13 through 28. For many women the second trimester is the easiest. Morning sickness and fatigue subside leaving your more energetic and feeling like your old self again. Second Trimester Fetal Development Milestones
Weeks 14 thru 16 – Gestational Age (Fetal age – Weeks 12 thru 14): The fetus’s skin is transparent and a fine hair called lanugo begins to form on the head. The fetus begins sucking and swallows bits of amniotic fluid. Fingerprints which individualize each human being have now developed on the tiny fingers of the fetus. Meconium is made in the intestinal tract and will build up to be the baby’s first bowel movement. Flutters may be felt in the mom’s growing abdomen, as the fetus begins to move around more.

Week 11 - Neurons multiply in the brain Month 3 Fetal development information weeks months trimesters Week Eleven: Neurons multiply
Weeks, Months and Trimesters Guides
Week Eleven: Neurons multiply
Week By Week Pregnancy Calendar
 The eyelids have fused shut and will not open again until around week 27. The wrists and ankles have formed and the fingers and toes are clearly visible. Genitals have begun to form, but it is too early to tell the sex of the fetus. By this week of the pregnancy the placenta has developed enough to support most of the critical job of producing hormones. By the 10th week of pregnancy, the crown to rump length of your growing baby is about 1. 5 inches (35mm). The baby weighs close to 0. 18 ounce (5g) and is the size of a small plum. First trimester Week by week: ultrasound scan pictures:

Week 11 - Neurons multiply in the brain Month 3 Fetal development information weeks months trimesters

Week Eleven: Neurons multiply
Weeks, Months and Trimesters Guides
Week Eleven: Neurons multiply
Week By Week Pregnancy Calendar

The eyelids have fused shut and will not open again until around week 27. The wrists and ankles have formed and the fingers and toes are clearly visible. Genitals have begun to form, but it is too early to tell the sex of the fetus. By this week of the pregnancy the placenta has developed enough to support most of the critical job of producing hormones. By the 10th week of pregnancy, the crown to rump length of your growing baby is about 1. 5 inches (35mm). The baby weighs close to 0. 18 ounce (5g) and is the size of a small plum. First trimester Week by week: ultrasound scan pictures:

Infants Remembered In Silence (IRIS) - Resources - Fetal Development Conception - 40 Weeks
 Week 10

The embryo is now about 1 inch in length. Facial features, limbs, hands, feet, fingers, and toes become apparent. The nervous system is responsive and many of the internal organs begin to function. The baby has begun moving inside the womb although it's too small for mom to notice. Most of the joints are formed now - elbow, wrist, knee, shoulder, and ankle as well as the hands, fingers, feet and toes. Week 11

Starting with this week, the baby is now called a fetus. The most critical part of the baby's development is over. This is a period of rapid growth, and the baby is about an inch or so in length at the beginning of the week and will be about 2 inches by the end of the week. The baby's head is about half its length. The eyelids will fuse shut, and the irises will begin to develop.

Week 10

The embryo is now about 1 inch in length. Facial features, limbs, hands, feet, fingers, and toes become apparent. The nervous system is responsive and many of the internal organs begin to function. The baby has begun moving inside the womb although it's too small for mom to notice. Most of the joints are formed now - elbow, wrist, knee, shoulder, and ankle as well as the hands, fingers, feet and toes. Week 11

Starting with this week, the baby is now called a fetus. The most critical part of the baby's development is over. This is a period of rapid growth, and the baby is about an inch or so in length at the beginning of the week and will be about 2 inches by the end of the week. The baby's head is about half its length. The eyelids will fuse shut, and the irises will begin to develop.

When Does an Embryo Become a Fetus? | New Health Advisor When Does an Embryo Become a Fetus?
When Does an Embryo Become a Fetus?
When Does an Embryo Become a Fetus?
The First Trimester: Baby Development Week by Week
Week 1-2
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Week 4
Week 5
Week 6
Week 7
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Week 9
Week 10
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Week 12
Embryo to Fetus: Weeks 9 to 12 of Pregnancy
What Happens Next?
 The head makes up around half of the fetus’s length, but the rest of the body soon catches up. The child’s liver begins to develop red blood cells, and external genitalia begin to develop around the end of the week. The baby is around 2 inches in length and weighs around 8 grams (1/3 ounce). Week 12
The child begins to develop fingernails and what can be considered a distinctive human face. The baby measures around 2 ½ inches, weighing around 14 grams (1/2 ounce). By this time, many mothers-to-be notice that their old cloths are becoming tight. For a detailed illustration of how the embryo becomes a fetus, please watch: YouTube
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When Does an Embryo Become a Fetus? | New Health Advisor

When Does an Embryo Become a Fetus?
When Does an Embryo Become a Fetus?
When Does an Embryo Become a Fetus?
The First Trimester: Baby Development Week by Week
Week 1-2
Week 3
Week 4
Week 5
Week 6
Week 7
Week 8
Week 9
Week 10
Week 11
Week 12
Embryo to Fetus: Weeks 9 to 12 of Pregnancy
What Happens Next?

The head makes up around half of the fetus’s length, but the rest of the body soon catches up. The child’s liver begins to develop red blood cells, and external genitalia begin to develop around the end of the week. The baby is around 2 inches in length and weighs around 8 grams (1/3 ounce). Week 12
The child begins to develop fingernails and what can be considered a distinctive human face. The baby measures around 2 ½ inches, weighing around 14 grams (1/2 ounce). By this time, many mothers-to-be notice that their old cloths are becoming tight. For a detailed illustration of how the embryo becomes a fetus, please watch: YouTube
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Growth of Your Baby in The First Trimester | Healthy Families BC Embryo and Fetal Development In the First Trimester
Embryo and Fetal Development In the First Trimester
During the first trimester, babies grow quickly - passing through two official stages of development.
Here's how the growth progresses:
The first trimester: a critical time for healthy choices
Resources & Links:
 Growth of Your Baby in The First Trimester | Healthy Families BC
You are here
At Home Articles & Resources Embryo and Fetal Development In the First Trimester
Embryo and Fetal Development In the First Trimester
January 29, 2018 by HealthyFamilies BC
Print
During the first trimester, babies grow quickly - passing through two official stages of development. For the first seven weeks, a developing baby is referred to as an "embryo." From eight weeks to birth, the formal term is "fetus." Here's how the growth progresses: About a week after conception, between days seven and 10, the fertilized ovum attaches to the lining of the uterus and the placenta starts to form. By about two weeks, when you miss your first period, the embryo becomes a layered disc on the uterine wall. As shown below, by about four weeks, major body systems are starting to develop. Time
Events
4 weeks
4 weeks
The embryo’s eyes, ears, nose, spine, digestive tract and nervous system are beginning to form. The tube for the future heart starts beating. 8 weeks
8 weeks
The fetus now has all the organs that a full term baby will have.

Growth of Your Baby in The First Trimester | Healthy Families BC

Embryo and Fetal Development In the First Trimester
Embryo and Fetal Development In the First Trimester
During the first trimester, babies grow quickly - passing through two official stages of development.
Here's how the growth progresses:
The first trimester: a critical time for healthy choices
Resources & Links:

Growth of Your Baby in The First Trimester | Healthy Families BC
You are here
At Home Articles & Resources Embryo and Fetal Development In the First Trimester
Embryo and Fetal Development In the First Trimester
January 29, 2018 by HealthyFamilies BC
Print
During the first trimester, babies grow quickly - passing through two official stages of development. For the first seven weeks, a developing baby is referred to as an "embryo." From eight weeks to birth, the formal term is "fetus." Here's how the growth progresses: About a week after conception, between days seven and 10, the fertilized ovum attaches to the lining of the uterus and the placenta starts to form. By about two weeks, when you miss your first period, the embryo becomes a layered disc on the uterine wall. As shown below, by about four weeks, major body systems are starting to develop. Time
Events
4 weeks
4 weeks
The embryo’s eyes, ears, nose, spine, digestive tract and nervous system are beginning to form. The tube for the future heart starts beating. 8 weeks
8 weeks
The fetus now has all the organs that a full term baby will have.

First Trimester The First Trimester
The First Trimester
The first prenatal visit
What to expect during the first trimester
Fetal development during the first trimester
First trimester growth and development benchmarks
Changes in the mother's body
 By the end of 4 weeks
All major systems and organs begin to form
The embryo looks like a tadpole
The neural tube (which becomes the brain and spinal cord), the digestive system, and the heart and circulatory system begin to form
The beginnings of the eyes and ears are developing
Tiny limb buds appear (which will develop into arms and legs)
The heart is beating
By the end of 8 weeks
All major body systems continue to develop and function, including the circulatory, nervous, digestive, and urinary systems
The embryo is taking on a human shape, although the head is larger in proportion to the rest of the body
The mouth is developing tooth buds (which will become baby teeth)
The eyes, nose, mouth, and ears are becoming more distinct
The arms and legs can be easily seen
The fingers and toes are still webbed, but can be clearly distinguished
The main organs continue to develop and you can hear the baby's heartbeat using an instrument called a Doppler
The bones begin to develop and the nose and jaws are rapidly developing
The embryo is in constant motion but cannot be felt by the mother
From embryo to fetus
After 8 weeks, the embryo is now referred to as a fetus (which means offspring). Although the fetus is only 1 to 1 1/2 inches long at this point, all major organs and systems have been formed. During weeks 9 to 12
The external genital organs are developed
Fingernails and toenails appear
Eyelids are formed
Fetal movement increases
The arms and legs are fully formed
The voice box (larynx) begins to form in the trachea
The fetus is most vulnerable during the first 12 weeks. During this period of time, all of the major organs and body systems are forming and can be damaged if the fetus is exposed to drugs, German measles, radiation, tobacco, and chemical and toxic substances. Even though the organs and body systems are fully formed by the end of 12 weeks, the fetus cannot survive independently. Changes in the mother's body
During pregnancy, many changes are also happening in the body of the mother-to-be. Women experience these changes differently. Some symptoms of pregnancy continue for several weeks or months. Others are only experienced for a short period of time. Some women experience many symptoms.

First Trimester

33 Weeks Pregnant Fetus, Baby and Fetal Development What to Expect in Week 33 of Your Pregnancy
What to Expect in Week 33 of Your Pregnancy
Thirty-Third Week of Pregnancy: Week by Week
IN THIS ARTICLE
What to expect at 33 Weeks of Pregnancy
At 33 Weeks of Fetal Development
Symptoms at 33 Weeks of Pregnancy
33 Weeks Pregnancy Ultrasound
Disclaimer
Stephanie McClane
 28 Weeks Pregnant Symptoms, Ultrasound, Fetus Development
At 33 Weeks of Fetal Development
Following changes can be seen in a baby at 33 weeks pregnancy:-
A baby at 33 weeks is nearly 43.68 cm or 17.2 inches long and weighs nearly 1.8 kg or 4 pounds. Immune system of a 33 week Fetus develops at a faster rate as antibodies are passed from a mother’s body to his so that he can successfully fight against infections and diseases
Bone development of a baby at 33 weeks is a continuous process as fetal skeleton hardens gradually. Skull bones do not fuse until birth so that it becomes easy for a baby to pass his head through birth-canal. In order to provide growth of tissue and proper expansion of brain, skull bones fuse when a child steps in adulthood. By this week, a baby is surrounded by at least one liter amniotic fluid so as to provide protection against outside impact. It signifies proper kidney functions as a baby passes urine at a rate of 500mml/day. In pregnancy at 33 weeks nervous system and brain are fully developed whereas iron is stored by liver to help in growth of baby after birth. Skin of baby becomes opaque and smooth and he/she starts looking the way he/she will look after birth. In 33 rd week a baby does not have enough space for his activities and he spends more time sleeping than waking. Uterine walls are now very thin and if a torch is shown on 33 weeks pregnant belly, a baby will easily determine it and move his head.

33 Weeks Pregnant Fetus, Baby and Fetal Development

What to Expect in Week 33 of Your Pregnancy
What to Expect in Week 33 of Your Pregnancy
Thirty-Third Week of Pregnancy: Week by Week
IN THIS ARTICLE
What to expect at 33 Weeks of Pregnancy
At 33 Weeks of Fetal Development
Symptoms at 33 Weeks of Pregnancy
33 Weeks Pregnancy Ultrasound
Disclaimer
Stephanie McClane

The Stages of Embryonic and Fetal Development | Life Persona The Stages of Embryonic and Fetal Development
The Stages of Embryonic and Fetal Development
Brief concepts before the stages of embryonic development
Fertilization
Development of the blastocyst
Development of the embryo
Development of the fetus and placenta
References
 Helps protect the embryo from injury since the amniotic sac is strong and resistant. Development of the fetus and placenta
At the end of the eighth week after fertilization (week 10 of pregnancy), the embryo is considered a fetus. During this stage, the structures that have already been formed grow and develop. The following are the characteristics of each week of pregnancy: At 12 weeks of pregnancy, the fetus fills the entire uterus. About 14 weeks, sex can be identified. Around 16 to 20 weeks, the pregnant woman can feel the movement of the fetus. Around 24 weeks, the fetus has a chance of surviving outside the womb. At week 25, the fetus is placed in the position for delivery. From week 37 to 42, labor may occur
The lungs continue to mature until near the time of birth and the brain accumulates new cells during pregnancy and until the first year of life after birth.

The Stages of Embryonic and Fetal Development | Life Persona

The Stages of Embryonic and Fetal Development
The Stages of Embryonic and Fetal Development
Brief concepts before the stages of embryonic development
Fertilization
Development of the blastocyst
Development of the embryo
Development of the fetus and placenta
References

Helps protect the embryo from injury since the amniotic sac is strong and resistant. Development of the fetus and placenta
At the end of the eighth week after fertilization (week 10 of pregnancy), the embryo is considered a fetus. During this stage, the structures that have already been formed grow and develop. The following are the characteristics of each week of pregnancy: At 12 weeks of pregnancy, the fetus fills the entire uterus. About 14 weeks, sex can be identified. Around 16 to 20 weeks, the pregnant woman can feel the movement of the fetus. Around 24 weeks, the fetus has a chance of surviving outside the womb. At week 25, the fetus is placed in the position for delivery. From week 37 to 42, labor may occur
The lungs continue to mature until near the time of birth and the brain accumulates new cells during pregnancy and until the first year of life after birth.

Your Developing Baby, Week by Week | Parents Your Developing Baby, Week by Week
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Week 10
Pregnancy week 10
Credit: Med ART Studios
Up until now your baby was classified as an embryo, but by the end of this week he will be a fetus and lots of changes are on the way. Paddle-like, or webbed, hands and feet will now separate into fingers and toes, bones will begin to harden and his kidneys are now producing urine. Most impressive? At this point your baby's brain is developing at astounding rates -- nearly 250,000 neurons are forming every minute! The end of the embryonic stage also marks a turning point for development dangers -- your baby is much less susceptible to them now. Boy or Girl? Find out now.

Your Developing Baby, Week by Week | Parents

Your Developing Baby, Week by Week
Your Developing Baby, Week by Week
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Week 10
Pregnancy week 10
Credit: Med ART Studios
Up until now your baby was classified as an embryo, but by the end of this week he will be a fetus and lots of changes are on the way. Paddle-like, or webbed, hands and feet will now separate into fingers and toes, bones will begin to harden and his kidneys are now producing urine. Most impressive? At this point your baby's brain is developing at astounding rates -- nearly 250,000 neurons are forming every minute! The end of the embryonic stage also marks a turning point for development dangers -- your baby is much less susceptible to them now. Boy or Girl? Find out now.

Baby Development Month By Month | American Pregnancy Association Baby Development Month By Month
Baby Development Month By Month
Baby Development Month by Month
Month 1 – Week 1-4
Month 2 – Week 5-9
Month 3 – Week 10-14
Month 4 – Week 15-19
Month 5 – Week 20-24
Month 6 – Week 25-30
Month 7 – Week 26-29
Month 8 – Week 30-34
Month 9 – Week 35-40+
A Happy Momma = A Happy Baby
Recommended Books On Baby Development Month By Month and Pregnancy:
Before Birth: A week-by-week guide to your baby’s development during pregnancy
In the Womb: Witness the Journey from Conception to Birth with Astonishing 3D Images
A Child Is Born: Fourth Edition of the Beloved Classic–Completely Revised and Updated
Pregnancy Day By Day
 Baby Development Month By Month | American Pregnancy Association
Baby Development Month By Month
Baby Development Month by Month
A baby grows and develops an amazing amount in just nine months. Here’s a short summary of how your baby’s development occurs during pregnancy. Be sure to sign up for our pregnancy week by week newsletter for pregnancy changes and baby development updates to your inbox weekly! Month 1 – Week 1-4
After an egg has been fertilized and implants into the uterine lining, a sac grows around it. This becomes the amniotic sac and will hold the amniotic fluid and cushion the embryo. The placenta also forms during this month. This will bring nutrition and support to the baby from the mother. The face and eyes begin to develop, and the heart begins to beat. By the end of the 4th week, your baby will slightly smaller than a grain of rice! B vitamins play a crucial role in you and your baby’s development and your health during pregnancy.

Baby Development Month By Month | American Pregnancy Association

Baby Development Month By Month
Baby Development Month By Month
Baby Development Month by Month
Month 1 – Week 1-4
Month 2 – Week 5-9
Month 3 – Week 10-14
Month 4 – Week 15-19
Month 5 – Week 20-24
Month 6 – Week 25-30
Month 7 – Week 26-29
Month 8 – Week 30-34
Month 9 – Week 35-40+
A Happy Momma = A Happy Baby
Recommended Books On Baby Development Month By Month and Pregnancy:
Before Birth: A week-by-week guide to your baby’s development during pregnancy
In the Womb: Witness the Journey from Conception to Birth with Astonishing 3D Images
A Child Is Born: Fourth Edition of the Beloved Classic–Completely Revised and Updated
Pregnancy Day By Day

Baby Development Month By Month | American Pregnancy Association
Baby Development Month By Month
Baby Development Month by Month
A baby grows and develops an amazing amount in just nine months. Here’s a short summary of how your baby’s development occurs during pregnancy. Be sure to sign up for our pregnancy week by week newsletter for pregnancy changes and baby development updates to your inbox weekly! Month 1 – Week 1-4
After an egg has been fertilized and implants into the uterine lining, a sac grows around it. This becomes the amniotic sac and will hold the amniotic fluid and cushion the embryo. The placenta also forms during this month. This will bring nutrition and support to the baby from the mother. The face and eyes begin to develop, and the heart begins to beat. By the end of the 4th week, your baby will slightly smaller than a grain of rice! B vitamins play a crucial role in you and your baby’s development and your health during pregnancy.

Week 11 - Neurons multiply in the brain Month 3 Fetal development information weeks months trimesters Week Eleven: Neurons multiply
Weeks, Months and Trimesters Guides
Week Eleven: Neurons multiply
Week By Week Pregnancy Calendar
 If it is a boy, the testicles are starting to produce the testosterone hormone. The baby has an upper lip, toes and ears and twenty little teeth are now forming. The brain is growing rapidly and producing more than 250,000 nerve cells a minute. The heart is almost completely developed and very much resembles that of a newborn baby. An opening the atrium of the heart and the presence of a bypass valve divert much of the blood away from the lungs, as the child's blood is oxygenated through the placenta. The eyelids have fused shut and will not open again until around week 27. The wrists and ankles have formed and the fingers and toes are clearly visible. Genitals have begun to form, but it is too early to tell the sex of the fetus. By this week of the pregnancy the placenta has developed enough to support most of the critical job of producing hormones. By the 10th week of pregnancy, the crown to rump length of your growing baby is about 1.

If it is a boy, the testicles are starting to produce the testosterone hormone. The baby has an upper lip, toes and ears and twenty little teeth are now forming. The brain is growing rapidly and producing more than 250,000 nerve cells a minute. The heart is almost completely developed and very much resembles that of a newborn baby. An opening the atrium of the heart and the presence of a bypass valve divert much of the blood away from the lungs, as the child's blood is oxygenated through the placenta. The eyelids have fused shut and will not open again until around week 27. The wrists and ankles have formed and the fingers and toes are clearly visible. Genitals have begun to form, but it is too early to tell the sex of the fetus. By this week of the pregnancy the placenta has developed enough to support most of the critical job of producing hormones. By the 10th week of pregnancy, the crown to rump length of your growing baby is about 1.

Embryonic Period | The first weeks after fertilization Embryonic Period
Embryonic Period
The first weeks after fertilization
Fertilization
Week 1
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Weeks 3 to 8
 In week eight, the ears and facial features are clearly visible. In most cases, the fetus now measures in at about an inch in length and weighs under an ounce. Early limb movements and brain waves can be recorded at this time. The embryonic stage of fetal development ceases at eight weeks from the moment of fertilization. At this point, embryogenesis is complete and the embryo has developed into an organism that we begin to call a fetus. The next stage of fetal development, the fetal period, is ready to begin. Pregnancy Symptoms
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Embryonic Period | The first weeks after fertilization

Embryonic Period
Embryonic Period
The first weeks after fertilization
Fertilization
Week 1
Week 2
Weeks 3 to 8

Embryonic Period | The first weeks after fertilization Embryonic Period
Embryonic Period
The first weeks after fertilization
Fertilization
Week 1
Week 2
Weeks 3 to 8
 Weeks 3 to 8
In the third week of embryogenesis, the embryo begins to develop a brain, heart and spinal cord. The beginnings of a gastrointestinal system first appear. In weeks four and five, arms and legs first begin to bud, as do the structures that will eventually become eyes and ears. Brain development continues, the heart beats at regular intervals and the first bones begin to form. In week seven, all essential organs have begun their development and fingers, toes, nipples and hair follicles begin to form. In week eight, the ears and facial features are clearly visible. In most cases, the fetus now measures in at about an inch in length and weighs under an ounce. Early limb movements and brain waves can be recorded at this time. The embryonic stage of fetal development ceases at eight weeks from the moment of fertilization. At this point, embryogenesis is complete and the embryo has developed into an organism that we begin to call a fetus.

Weeks 3 to 8
In the third week of embryogenesis, the embryo begins to develop a brain, heart and spinal cord. The beginnings of a gastrointestinal system first appear. In weeks four and five, arms and legs first begin to bud, as do the structures that will eventually become eyes and ears. Brain development continues, the heart beats at regular intervals and the first bones begin to form. In week seven, all essential organs have begun their development and fingers, toes, nipples and hair follicles begin to form. In week eight, the ears and facial features are clearly visible. In most cases, the fetus now measures in at about an inch in length and weighs under an ounce. Early limb movements and brain waves can be recorded at this time. The embryonic stage of fetal development ceases at eight weeks from the moment of fertilization. At this point, embryogenesis is complete and the embryo has developed into an organism that we begin to call a fetus.

Miscarriage After Detecting a Heartbeat on Ultrasound Odds of Miscarrying After Seeing a Heartbeat on Ultrasound
Odds of Miscarrying After Seeing a Heartbeat on Ultrasound
Miscarriage After Seeing a Heartbeat
First Trimester Miscarriage
Second-Trimester Miscarriage
Fetal Development Milestones
Week 5
Weeks 6–9
Weeks 10–14
Weeks 15–18
 Your baby's external features also begin to develop during week five. The fifth week is a period of rapid growth for your baby. During week five, your baby is most sensitive to teratogens (things that may cause birth defects) such as illicit drugs, certain medications, and infections. Weeks 6–9
During weeks six and seven, your baby's heart begins to grow and beat at a regular rhythm. At this time, your baby's eyes, earbuds, and spine begin to form and the blood begins to circulate. During week eight, your baby's arms start to grow longer. The hands and feet look like paddles and the lungs start to form. By week nine, all of your baby's organs have started to grow. Additionally, hair follicles begin to develop, as well as your baby's toes. Weeks 10–14
At end of the tenth week of pregnancy, your baby is no longer an embryo and is instead called a fetus.

Miscarriage After Detecting a Heartbeat on Ultrasound

Odds of Miscarrying After Seeing a Heartbeat on Ultrasound
Odds of Miscarrying After Seeing a Heartbeat on Ultrasound
Miscarriage After Seeing a Heartbeat
First Trimester Miscarriage
Second-Trimester Miscarriage
Fetal Development Milestones
Week 5
Weeks 6–9
Weeks 10–14
Weeks 15–18

Your baby's external features also begin to develop during week five. The fifth week is a period of rapid growth for your baby. During week five, your baby is most sensitive to teratogens (things that may cause birth defects) such as illicit drugs, certain medications, and infections. Weeks 6–9
During weeks six and seven, your baby's heart begins to grow and beat at a regular rhythm. At this time, your baby's eyes, earbuds, and spine begin to form and the blood begins to circulate. During week eight, your baby's arms start to grow longer. The hands and feet look like paddles and the lungs start to form. By week nine, all of your baby's organs have started to grow. Additionally, hair follicles begin to develop, as well as your baby's toes. Weeks 10–14
At end of the tenth week of pregnancy, your baby is no longer an embryo and is instead called a fetus.

Fetal Period | The final stage of fetal development Fetal Period
Fetal Period
The final stage of fetal development
Weeks 10 to 12
Weeks 13 to 16
Weeks 17 to 20
Weeks 21 to 25
Weeks 26 to 28
Weeks 29 to 36
Weeks 37 to 40
 By week 28, gas exchange is possible and the fetus may survive outside of the womb. The brain is also developing at a fast pace and the fetus' nervous system begins to control some of its bodily functions. Around week 28, the eyelids open for the first time since early in the embryonic period of development. Weeks 29 to 36
Between weeks 29 and 35, the lungs continue to develop and the fetus puts on weight (much of it in the form of body fat). The fetus develops its first immunities, increasing the likelihood of survival should a premature birth take place (by week 36, an infant has a high probability of survival, provided it receives sufficient medical care). Around week 35, lanugo begins to be shed and may be replaced by vellus hair (colloquially known as "peach fuzz"). Weeks 37 to 40
By week 37, the fetus is considered to have been carried to its full term. It may have a full head of hair and its fingernails and toenails may extend past the ends of its fingers and toes. During this time, the fetus can gain as much as half a pound of weight every week. Select Week 1 Week Pregnant 2 Weeks Pregnant 3 Weeks Pregnant 4 Weeks Pregnant 5 Weeks Pregnant 6 Weeks Pregnant 7 Weeks Pregnant 8 Weeks Pregnant 9 Weeks Pregnant 10 Weeks Pregnant 11 Weeks Pregnant 12 Weeks Pregnant 13 Weeks Pregnant 14 Weeks Pregnant 15 Weeks Pregnant 16 Weeks Pregnant 17 Weeks Pregnant 18 Weeks Pregnant 19 Weeks Pregnant 20 Weeks Pregnant 21 Weeks Pregnant 22 Weeks Pregnant 23 Weeks Pregnant 24 Weeks Pregnant 25 Weeks Pregnant 26 Weeks Pregnant 27 Weeks Pregnant 28 Weeks Pregnant 29 Weeks Pregnant 30 Weeks Pregnant 31 Weeks Pregnant 32 Weeks Pregnant 33 Weeks Pregnant 34 Weeks Pregnant 35 Weeks Pregnant 36 Weeks Pregnant 37 Weeks Pregnant 38 Weeks Pregnant 39 Weeks Pregnant 40 Weeks Pregnant

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Pregnancy Calendar
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Beautiful Pregnancy Tickers for your MySpace Layouts
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Embryonic Period
Fetal Period
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Placenta
Umbilical Cord
Fetal Senses
Fetal Movement
Fetal Development Pictures
Labor and Delivery
Prenatal Care and Pregnancy Professionals
Cord Blood Banking
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New Baby
Postpartum
Child Health Care
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Select One April 2011 Due Date Club April 2012 Due Date Club April 2015 Due Date Club Archived Due Date Clubs August 2011 Due Date Club August 2012 Due Date Club August 2015 Due Date Club Baby Names Community News Coupons, Deals and Freebies December 2011 Due Date Club December 2012 Due Date Club December 2015 Due Date Club Due Date Clubs February 2011 Due Date Club February 2012 Due Date Club February 2015 Due Date Club General Discussion Health January 2011 Due Date Club January 2012 Due Date Club January 2015 Due Date Club July 2011 Due Date Club July 2012 Due Date Club July 2015 Due Date Club June 2011 Due Date Club June 2012 Due Date Club June 2015 Due Date Club March 2011 Due Date Club March 2012 Due Date Club March 2015 Due Date Club May 2011 Due Date Club May 2012 Due Date Club May 2015 Due Date Club Maybe Pregnant November 2011 Due Date Club November 2012 Due Date Club November 2015 Due Date Club October 2011 Due Date Club October 2012 Due Date Club October 2015 Due Date Club PCOS Pregnancy Topics Product Reviews September 2011 Due Date Club September 2012 Due Date Club September 2015 Due Date Club Too Hot to Handle Trying to Conceive

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Fetal Period | The final stage of fetal development

Fetal Period
Fetal Period
The final stage of fetal development
Weeks 10 to 12
Weeks 13 to 16
Weeks 17 to 20
Weeks 21 to 25
Weeks 26 to 28
Weeks 29 to 36
Weeks 37 to 40

 The heart is starting up. The fetus` blood group may be different from your own! Facial features are visible, including a mouth and tongue. The eyes have a retina and lens. The digestive system starts forming, beginning with the first cells of the stomach and the intestine. There are small indentations in the head, ready for the development of facial features, eyes, and ears. The outline of the jaw starts to form. 7th Week
This week your baby has an amazing growth spurt. At the beginning of this week, your baby is approximately 4 to 5 mm and by the end of the week it has more than doubled to 11 to 13 mm! Your baby weights approximately 0.03 ounces.

The heart is starting up. The fetus` blood group may be different from your own! Facial features are visible, including a mouth and tongue. The eyes have a retina and lens. The digestive system starts forming, beginning with the first cells of the stomach and the intestine. There are small indentations in the head, ready for the development of facial features, eyes, and ears. The outline of the jaw starts to form. 7th Week
This week your baby has an amazing growth spurt. At the beginning of this week, your baby is approximately 4 to 5 mm and by the end of the week it has more than doubled to 11 to 13 mm! Your baby weights approximately 0.03 ounces.

Prenatal Development - baby, stages, average, Definition, Description, Common problems Prenatal development
Prenatal development
Definition
Description
Germinal stage
Embryonic stage
Fetal stage
Common problems
Congenital abnormalities
Maternal derived abnormalities
Prematurity
KEY TERMS
Parental concerns
Resources
BOOKS
PERIODICALS
ORGANIZATIONS
WEB SITES
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 first formation of urine in the kidneys  and first evidence of brain waves. Week 8: Facial features more distinct, internal organs well developed,  the brain can signal for muscles to move, heart development ends,  external sex organs begin to form. By the end of the embryonic stage, all essential external and internal  structures have been formed. The embryo is now referred to as a fetus. Fetal stage
Prenatal development is most dramatic during the fetal stage. When an  embryo becomes a fetus at eight weeks, it is approximately 3 centimeters  (1.2 inches) in length from crown to rump and weighs about 3 grams (0.1  ounce). By the time the fetus is considered full-term at 38 weeks  gestation, he or she may be 50 centimeters (20 inches) or 3.3 kilograms  (7.3 pounds). Although all of the organ systems were formed during  embryonic development, they continue to develop and grow during the fetal  stage. Examples of some of the major features of fetal development by week  are as follows:

Prenatal Development - baby, stages, average, Definition, Description, Common problems

Prenatal development
Prenatal development
Definition
Description
Germinal stage
Embryonic stage
Fetal stage
Common problems
Congenital abnormalities
Maternal derived abnormalities
Prematurity
KEY TERMS
Parental concerns
Resources
BOOKS
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first formation of urine in the kidneys  and first evidence of brain waves. Week 8: Facial features more distinct, internal organs well developed,  the brain can signal for muscles to move, heart development ends,  external sex organs begin to form. By the end of the embryonic stage, all essential external and internal  structures have been formed. The embryo is now referred to as a fetus. Fetal stage
Prenatal development is most dramatic during the fetal stage. When an  embryo becomes a fetus at eight weeks, it is approximately 3 centimeters  (1.2 inches) in length from crown to rump and weighs about 3 grams (0.1  ounce). By the time the fetus is considered full-term at 38 weeks  gestation, he or she may be 50 centimeters (20 inches) or 3.3 kilograms  (7.3 pounds). Although all of the organ systems were formed during  embryonic development, they continue to develop and grow during the fetal  stage. Examples of some of the major features of fetal development by week  are as follows:

Prenatal Development | Introduction to Psychology
Prenatal Development
What you’ll learn to do: explain the physical, cognitive, and emotional development that occurs from infancy through childhood
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Learning Objectives
Prenatal Development
Germinal Stage (Weeks 1–2)
Embryonic Stage (Weeks 3–8)
Fetal Stage (Weeks 9–40)
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Prenatal Influences
Table 1. Fetal Alcohol Syndrome Facial Features
What Do You Think? Should Women Who Use Drugs During Pregnancy Be Arrested and Jailed?
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Infancy
Link to Learning
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Glossary
 Fingers and toes are fully developed, and fingerprints are visible. By the time the fetus reaches the sixth month of development (24 weeks), it weighs up to 1.4 pounds. Hearing has developed, so the fetus can respond to sounds. The internal organs, such as the lungs, heart, stomach, and intestines, have formed enough that a fetus born prematurely at this point has a chance to survive outside of the mother’s womb. Throughout the fetal stage the brain continues to grow and develop, nearly doubling in size from weeks 16 to 28. Around 36 weeks, the fetus is almost ready for birth. It weighs about 6 pounds and is about 18.5 inches long, and by week 37 all of the fetus’s organ systems are developed enough that it could survive outside the mother’s uterus without many of the risks associated with premature birth. The fetus continues to gain weight and grow in length until approximately 40 weeks. By then, the fetus has very little room to move around and birth becomes imminent. The progression through the stages is shown in Figure 2.

Prenatal Development | Introduction to Psychology

Prenatal Development
What you’ll learn to do: explain the physical, cognitive, and emotional development that occurs from infancy through childhood
Watch It
Learning Objectives
Prenatal Development
Germinal Stage (Weeks 1–2)
Embryonic Stage (Weeks 3–8)
Fetal Stage (Weeks 9–40)
Try It
Prenatal Influences
Table 1. Fetal Alcohol Syndrome Facial Features
What Do You Think? Should Women Who Use Drugs During Pregnancy Be Arrested and Jailed?
Try It
Infancy
Link to Learning
Try It
Glossary

Fingers and toes are fully developed, and fingerprints are visible. By the time the fetus reaches the sixth month of development (24 weeks), it weighs up to 1.4 pounds. Hearing has developed, so the fetus can respond to sounds. The internal organs, such as the lungs, heart, stomach, and intestines, have formed enough that a fetus born prematurely at this point has a chance to survive outside of the mother’s womb. Throughout the fetal stage the brain continues to grow and develop, nearly doubling in size from weeks 16 to 28. Around 36 weeks, the fetus is almost ready for birth. It weighs about 6 pounds and is about 18.5 inches long, and by week 37 all of the fetus’s organ systems are developed enough that it could survive outside the mother’s uterus without many of the risks associated with premature birth. The fetus continues to gain weight and grow in length until approximately 40 weeks. By then, the fetus has very little room to move around and birth becomes imminent. The progression through the stages is shown in Figure 2.

Pregnancy Stages: Pregnancy Trimester Breakdown - Easyworknet Pregnancy Stages: Pregnancy Trimester Breakdown
Pregnancy Stages: Pregnancy Trimester Breakdown
Determining Pregnancy
Weight Gain
Distribution of gained weight
Complications
The Trimester’s stages of Pregnancy
The First Trimester
The first 4 weeks
During the first 4 weeks, the baby develops like:
End of 8th weeks
9 to 13 weeks
Time for trimester second to begin
Some of the changes include:
Decision-Making time for every pregnant woman
Baby’s growth during the second trimester
Time For The Third Trimester
There are more physical changes faced during the third trimester like:
Growth of baby from thirty-second and thirty-sixth week
Which stage is the most crucial of all stages?
Pregnancy Tips For Women
Sambit Barua
 The first 4 weeks
The end of four months and your baby will develop the major systems and organs start forming, eyes, ears begin taking shape and while the heart starts beating, the baby also develops ting limbs which are equivalent to buds. During the first 4 weeks, the baby develops like: Its nervous starts forming
Its Heart begins to form
Arms and leg buds start developing
The baby is now an embryo
End of 8th weeks
As the body systems have already started taking shape, in this phase the development takes place further i.e. your baby will grow nervous, digestive, urinary and circulatory system. During this period the human shape begins developing and the features of your baby will be defined and this is when you would take an ultrasound test and you can clearly see the baby fingers and toes. At the eight weeks, the embryo turns or one should say it graduates to become a fetus. The development is apparent as one witness: The Umbilical cord to which the fetus is attached turns completely visible
Its heart starts beating
The main body organs have begun forming
Arms and legs grow longer
The facial features start developing
Sex organs, toes and fingers start forming
The baby now turns an inch long
9 to 13 weeks
In this period, arm and legs are completely developed. That is the external organs as well are developed as the baby now has nails in fingers and toes. The movement of the fetus is also excess in this period as compared to the previous phases. During this period, your baby will also grow eyelids and so will the voice box develop in the baby’s trachea.

Pregnancy Stages: Pregnancy Trimester Breakdown - Easyworknet

Pregnancy Stages: Pregnancy Trimester Breakdown
Pregnancy Stages: Pregnancy Trimester Breakdown
Determining Pregnancy
Weight Gain
Distribution of gained weight
Complications
The Trimester’s stages of Pregnancy
The First Trimester
The first 4 weeks
During the first 4 weeks, the baby develops like:
End of 8th weeks
9 to 13 weeks
Time for trimester second to begin
Some of the changes include:
Decision-Making time for every pregnant woman
Baby’s growth during the second trimester
Time For The Third Trimester
There are more physical changes faced during the third trimester like:
Growth of baby from thirty-second and thirty-sixth week
Which stage is the most crucial of all stages?
Pregnancy Tips For Women
Sambit Barua

Reproductive Process Egg to Embryo to Fetus: The Reproduction and Development Process
Egg to Embryo to Fetus: The Reproduction and Development Process
Vagina
1. Fertilization: A Sperm and an Egg Form a Zygote
2. The Zygote Becomes an Embryo: Development Prior to and During Implantation
3. In Eight Weeks, the Embryo Develops; By the End of Week 10 It Becomes a Fetus
4. Fetal Development Ends with Labor, a Three-Stage Process
5. Humans Must Develop Male or Female Gonads and Genitalia to be Capable of Reproduction
External Sources
 They begin to curve and fold and to form an oblong body. By week 4, the embryo has a distinct head and tail and a beating heart. Over the next six weeks, limbs, eyes, brain regions, and vertebrae form. Primitive versions of all body systems appear. By the end of week 10, the embryo is a fetus. ( Note: Pregnancy is often measured in terms of gestational age—age of the fetus starting with the first day of a woman’s last menstrual period—and embryonic or fetal age—actual age of the growing fetus. We are referring to the gestational age of the fetus.) 4. Fetal Development Ends with Labor, a Three-Stage Process
From week 10 of pregnancy, the fetus grows inside the uterus, fueled by nutrient-rich blood supplied by the umbilical cord.

Reproductive Process

Egg to Embryo to Fetus: The Reproduction and Development Process
Egg to Embryo to Fetus: The Reproduction and Development Process
Vagina
1. Fertilization: A Sperm and an Egg Form a Zygote
2. The Zygote Becomes an Embryo: Development Prior to and During Implantation
3. In Eight Weeks, the Embryo Develops; By the End of Week 10 It Becomes a Fetus
4. Fetal Development Ends with Labor, a Three-Stage Process
5. Humans Must Develop Male or Female Gonads and Genitalia to be Capable of Reproduction
External Sources

They begin to curve and fold and to form an oblong body. By week 4, the embryo has a distinct head and tail and a beating heart. Over the next six weeks, limbs, eyes, brain regions, and vertebrae form. Primitive versions of all body systems appear. By the end of week 10, the embryo is a fetus. ( Note: Pregnancy is often measured in terms of gestational age—age of the fetus starting with the first day of a woman’s last menstrual period—and embryonic or fetal age—actual age of the growing fetus. We are referring to the gestational age of the fetus.) 4. Fetal Development Ends with Labor, a Three-Stage Process
From week 10 of pregnancy, the fetus grows inside the uterus, fueled by nutrient-rich blood supplied by the umbilical cord.

Prenatal Development | Lifespan Development
Prenatal Development
What you’ll learn to do: explain the main stages of prenatal development
Learning outcomes
Prenatal Development
Periods of Prenatal Development
The Germinal Period (Weeks 1-2)
The Embryonic Period (Weeks 3-8)
The Fetal Period (Weeks 9-40)
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Environmental Risks
Teratology
A Look at Some Teratogens
Alcohol
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Tobacco
Drugs
Environmental Chemicals
Sexually Transmitted Infections
Maternal Diseases
Maternal Stress
Factors influencing prenatal risks
Interactive: reducing the risk
Mystery Client
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Complications of Pregnancy and Delivery
Complications of Pregnancy and Delivery
Major Complications
Maternal Mortality
Watch It: Maternal Mortality in the united States
Miscarriage
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Glossary
 At this stage, the fetus is about the size of a kidney bean and begins to take on the recognizable form of a human being as the “tail” begins to disappear. From 9–12 weeks, the sex organs begin to differentiate. By the 12th week, the fetus has all its body parts including external genitalia. In the following weeks, the fetus will develop hair, nails, teeth and the excretory and digestive systems will continue to develop. At the end of the 12th week, the fetus is about 3 inches long and weighs about 28 grams. At about 16 weeks, the fetus is approximately 4.5 inches long. Fingers and toes are fully developed, and fingerprints are visible. During the 4-6th months, the eyes become more sensitive to light and hearing develops. The respiratory system continues to develop. Reflexes such as sucking, swallowing and hiccuping develop during the 5th month.

Prenatal Development | Lifespan Development

Prenatal Development
What you’ll learn to do: explain the main stages of prenatal development
Learning outcomes
Prenatal Development
Periods of Prenatal Development
The Germinal Period (Weeks 1-2)
The Embryonic Period (Weeks 3-8)
The Fetal Period (Weeks 9-40)
Watch It
Try It
Environmental Risks
Teratology
A Look at Some Teratogens
Alcohol
watch it
Tobacco
Drugs
Environmental Chemicals
Sexually Transmitted Infections
Maternal Diseases
Maternal Stress
Factors influencing prenatal risks
Interactive: reducing the risk
Mystery Client
Try It
Complications of Pregnancy and Delivery
Complications of Pregnancy and Delivery
Major Complications
Maternal Mortality
Watch It: Maternal Mortality in the united States
Miscarriage
Try It
Glossary

At this stage, the fetus is about the size of a kidney bean and begins to take on the recognizable form of a human being as the “tail” begins to disappear. From 9–12 weeks, the sex organs begin to differentiate. By the 12th week, the fetus has all its body parts including external genitalia. In the following weeks, the fetus will develop hair, nails, teeth and the excretory and digestive systems will continue to develop. At the end of the 12th week, the fetus is about 3 inches long and weighs about 28 grams. At about 16 weeks, the fetus is approximately 4.5 inches long. Fingers and toes are fully developed, and fingerprints are visible. During the 4-6th months, the eyes become more sensitive to light and hearing develops. The respiratory system continues to develop. Reflexes such as sucking, swallowing and hiccuping develop during the 5th month.

Prenatal Summary Prenatal Summary
Prenatal Summary
The First Two Weeks
2 to 4 Weeks
4 to 6 Weeks
6 to 8 Weeks
8 to 10 Weeks
10 to 12 Weeks
12 to 14 Weeks
14 to 16 Weeks
16 to 18 Weeks
18 to 20 Weeks
20 to 22 Weeks
22 to 24 Weeks
24 to 26 Weeks
26 to 28 Weeks
28 to 30 Weeks
30 to 32 Weeks
32 to 34 Weeks
34 to 36 Weeks
36 to 38 Weeks
38 to 40 Weeks
Free licensed content for government health and education departments
 56
The 14-week fetus weighs about 2 ounces and measures slightly less than 5 inches from head to heel. 14 to 16 Weeks
By 15 weeks the entire fetus (except for parts of the scalp) responds to light touch. 57 Tooth development is underway. 58
Gender differences emerge at 16 weeks when girl fetuses move their jaws more often than boys. 59
A pregnant woman may begin to feel fetal movement at this time. 60
The 16-week fetus weighs about 4 ounces and measures slightly less than 7 inches from head to heel. Hormonal Stress Response

16 to 18 Weeks
Production of a variety of digestive enzymes is well underway. 61
Around 17 weeks blood cell formation moves to its permanent location inside the bone marrow 62 and the fetus begins storing energy in the form of body fat. 63
By 18 weeks formation of the breathing passages, called the bronchial tree, is complete. 64 The fetus releases stress hormones in response to being poked with a needle.

Prenatal Summary

Prenatal Summary
Prenatal Summary
The First Two Weeks
2 to 4 Weeks
4 to 6 Weeks
6 to 8 Weeks
8 to 10 Weeks
10 to 12 Weeks
12 to 14 Weeks
14 to 16 Weeks
16 to 18 Weeks
18 to 20 Weeks
20 to 22 Weeks
22 to 24 Weeks
24 to 26 Weeks
26 to 28 Weeks
28 to 30 Weeks
30 to 32 Weeks
32 to 34 Weeks
34 to 36 Weeks
36 to 38 Weeks
38 to 40 Weeks
Free licensed content for government health and education departments

56
The 14-week fetus weighs about 2 ounces and measures slightly less than 5 inches from head to heel. 14 to 16 Weeks
By 15 weeks the entire fetus (except for parts of the scalp) responds to light touch. 57 Tooth development is underway. 58
Gender differences emerge at 16 weeks when girl fetuses move their jaws more often than boys. 59
A pregnant woman may begin to feel fetal movement at this time. 60
The 16-week fetus weighs about 4 ounces and measures slightly less than 7 inches from head to heel. Hormonal Stress Response

16 to 18 Weeks
Production of a variety of digestive enzymes is well underway. 61
Around 17 weeks blood cell formation moves to its permanent location inside the bone marrow 62 and the fetus begins storing energy in the form of body fat. 63
By 18 weeks formation of the breathing passages, called the bronchial tree, is complete. 64 The fetus releases stress hormones in response to being poked with a needle.

Miscarriage After Detecting a Heartbeat on Ultrasound Odds of Miscarrying After Seeing a Heartbeat on Ultrasound
Odds of Miscarrying After Seeing a Heartbeat on Ultrasound
Miscarriage After Seeing a Heartbeat
First Trimester Miscarriage
Second-Trimester Miscarriage
Fetal Development Milestones
Week 5
Weeks 6–9
Weeks 10–14
Weeks 15–18
 During week eight, your baby's arms start to grow longer. The hands and feet look like paddles and the lungs start to form. By week nine, all of your baby's organs have started to grow. Additionally, hair follicles begin to develop, as well as your baby's toes. Weeks 10–14
At end of the tenth week of pregnancy, your baby is no longer an embryo and is instead called a fetus. In other words, your baby has exited the embryonic stage. During this week of pregnancy, your child's eyelids and outer ears begin to form and the intestines rotate. During weeks 11 through 14, the genitals begin to develop and the face is well-formed. Weeks 15–18
Your baby's liver and pancreas form. At this stage the skin is transparent and the baby starts to make sucking motions.

During week eight, your baby's arms start to grow longer. The hands and feet look like paddles and the lungs start to form. By week nine, all of your baby's organs have started to grow. Additionally, hair follicles begin to develop, as well as your baby's toes. Weeks 10–14
At end of the tenth week of pregnancy, your baby is no longer an embryo and is instead called a fetus. In other words, your baby has exited the embryonic stage. During this week of pregnancy, your child's eyelids and outer ears begin to form and the intestines rotate. During weeks 11 through 14, the genitals begin to develop and the face is well-formed. Weeks 15–18
Your baby's liver and pancreas form. At this stage the skin is transparent and the baby starts to make sucking motions.

My Pregnancy: The Second Trimester (2nd Trimester) | Women's Health articles | Family Health center | SteadyHealth.com My Pregnancy: The Second Trimester (2nd Trimester)
My Pregnancy: The Second Trimester (2nd Trimester)
What Does the Second Trimester Mean for an Expectant Mother?
Fetal Development: Weeks 14-28
What Does an Expectant Mother Experience During the 2nd Trimester?
Maternal Check-up During 2nd Trimester
Recommended Weight Gain for Women During the 2nd Trimester
General Facts About the 2nd Trimester
The End of the 2nd Trimester
Sources & Links
 Week 25: structures of the spine begin to form, blood vessels of the lungs develop. Fetal nostrils begin to open, nerves around the mouth and lips are more sensitive, swallowing reflex develop. Fetus is around 14 inches in length and weighs around 1.46 pounds. Week 26: the spine is becoming stronger and more supple, the spine contains 150 joints, 33 rings and more than 1,000 ligaments. Air sacs of the lungs now form, lungs begin secreting surfactant, eyes begin to open and blink, retinas form and brain wave activity on a fetal scan shows marked response to touch. Fetus is approximately 14 inches in length and weighs around 1.8- 2 pounds. Week 27: brain continues rapid growth, response to sounds grow more consistent, network of nerves to the ear will be completely developed by the end of the month.

My Pregnancy: The Second Trimester (2nd Trimester) | Women's Health articles | Family Health center | SteadyHealth.com

My Pregnancy: The Second Trimester (2nd Trimester)
My Pregnancy: The Second Trimester (2nd Trimester)
What Does the Second Trimester Mean for an Expectant Mother?
Fetal Development: Weeks 14-28
What Does an Expectant Mother Experience During the 2nd Trimester?
Maternal Check-up During 2nd Trimester
Recommended Weight Gain for Women During the 2nd Trimester
General Facts About the 2nd Trimester
The End of the 2nd Trimester
Sources & Links

Week 25: structures of the spine begin to form, blood vessels of the lungs develop. Fetal nostrils begin to open, nerves around the mouth and lips are more sensitive, swallowing reflex develop. Fetus is around 14 inches in length and weighs around 1.46 pounds. Week 26: the spine is becoming stronger and more supple, the spine contains 150 joints, 33 rings and more than 1,000 ligaments. Air sacs of the lungs now form, lungs begin secreting surfactant, eyes begin to open and blink, retinas form and brain wave activity on a fetal scan shows marked response to touch. Fetus is approximately 14 inches in length and weighs around 1.8- 2 pounds. Week 27: brain continues rapid growth, response to sounds grow more consistent, network of nerves to the ear will be completely developed by the end of the month.

Pregnancy Symptoms & Stages Week by Week Pregnancy Week by Week (First, Second, and Third Trimester)
Pregnancy Week by Week (First, Second, and Third Trimester)
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 Get excited -- the final countdown has begun! SLIDESHOW
Stages of Pregnancy: Week by Week See Slideshow
How will my baby develop week by week? First Trimester (week 1-week 12)
At 4 to 5 weeks: Your baby's brain and spinal cord have begun to form. The heart begins to form. Arm and leg buds appear. Your baby is now an embryo and one-twenty-fifth inch long. At 8 weeks: All major organs and external body structures have begun to form.

Pregnancy Symptoms & Stages Week by Week

Get excited -- the final countdown has begun! SLIDESHOW
Stages of Pregnancy: Week by Week See Slideshow
How will my baby develop week by week? First Trimester (week 1-week 12)
At 4 to 5 weeks: Your baby's brain and spinal cord have begun to form. The heart begins to form. Arm and leg buds appear. Your baby is now an embryo and one-twenty-fifth inch long. At 8 weeks: All major organs and external body structures have begun to form.

Fetal development: MedlinePlus Medical Encyclopedia Fetal development
Fetal development
Information
Click to Keep Reading
 Muscles and bones are fully developed. Week 38 to 40
Lanugo is gone except for on the upper arms and shoulders. Fingernails may extend beyond fingertips. Small breast buds are present on both sexes. Head hair is now coarse and thicker. In your 40th week of pregnancy, it has been 38 weeks since conception, and your baby could be born any day now. Click to Keep Reading
Alternative Names
Expand Section
Zygote; Blastocyst; Embryo; Fetus
Images
Expand Section
Fetus at 3.5 weeks
Fetus at 7.5 weeks
Fetus at 8.5 weeks
Fetus at 10 weeks
Fetus at 12 weeks
Fetus at 16 weeks
24-week fetus
Fetus at 26 to 30 weeks
Fetus at 30 to 32 weeks
References
Expand Section
Feigelman S, Finkelstein LH.

Fetal development: MedlinePlus Medical Encyclopedia

Fetal development
Fetal development
Information
Click to Keep Reading

Muscles and bones are fully developed. Week 38 to 40
Lanugo is gone except for on the upper arms and shoulders. Fingernails may extend beyond fingertips. Small breast buds are present on both sexes. Head hair is now coarse and thicker. In your 40th week of pregnancy, it has been 38 weeks since conception, and your baby could be born any day now. Click to Keep Reading
Alternative Names
Expand Section
Zygote; Blastocyst; Embryo; Fetus
Images
Expand Section
Fetus at 3.5 weeks
Fetus at 7.5 weeks
Fetus at 8.5 weeks
Fetus at 10 weeks
Fetus at 12 weeks
Fetus at 16 weeks
24-week fetus
Fetus at 26 to 30 weeks
Fetus at 30 to 32 weeks
References
Expand Section
Feigelman S, Finkelstein LH.

Your Baby's Development | American Pregnancy Association Fetal development
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Your Baby's Development | American Pregnancy Association

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Fetal development
Fetal Development – How to Calculate

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The second trimester is from week 13 through 28. For many women...
Posted on: Categories: Pregnancy Health and Wellness
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Third Trimester of Pregnancy: Fetal Development
The third trimester of pregnancy starts in week 28 of your pregnancy...
Posted on: Categories: Pregnancy Health and Wellness
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Baby Development Month By Month
https://youtu.be/WtDknjng8TA Baby Development Month by Month A baby grows and develops an...
Posted on: 11/16/2019
Categories: Week by Week Newsletter
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First Fetal Movement: Quickening
Some moms can feel their baby move as early as 13-16 weeks...
Posted on:

18 weeks pregnant: fetal development - BabyCenter Australia 18 weeks pregnant: fetal development
18 weeks pregnant: fetal development
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 nd. 16 wks post fertilization: fingerprints and toe prints begin. The Visible Embryo. www.visembryo.com [Accessed March 2020]
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18 weeks pregnant: fetal development - BabyCenter Australia

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nd. 16 wks post fertilization: fingerprints and toe prints begin. The Visible Embryo. www.visembryo.com [Accessed March 2020]
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Human Fertilization and Embryogenesis - Online Biology Notes Human Fertilization and Embryogenesis
Human Fertilization and Embryogenesis
Human Fertilization and Embryogenesis
Fertilization
Embryogenesis
Summary of embryonic and fetal development
Human Fertilization and Embryogenesis
 heart, blood vessel, blood, gut start forming, umbilical cord develop, embryo 5mm size
Week5: brain developing, limb buds, heart beats starts (seen on USG), embryo 8 mm long
Week 6: eyes and ear form, embryo known as f etus
Week 7: internal organs, face form, limbs, mouth and tongue, fetus 17mm size. By Week 12: fetus fully form, sex organ develop, fetus starts moving, 56mm long,
By week 20: Hair and nails begins to grow, fingerprint develop, firm hand grip, movement of fetus can be felt, 160m long,
By Week 24: eyelid opens, legal limit for abortion,
By week 26: good chance of survival if prematurely born
By week 28: respond to touch and sound, swallowing amniotic fluid, urinating
By week 30:

Human Fertilization and Embryogenesis - Online Biology Notes

Human Fertilization and Embryogenesis
Human Fertilization and Embryogenesis
Human Fertilization and Embryogenesis
Fertilization
Embryogenesis
Summary of embryonic and fetal development
Human Fertilization and Embryogenesis

heart, blood vessel, blood, gut start forming, umbilical cord develop, embryo 5mm size
Week5: brain developing, limb buds, heart beats starts (seen on USG), embryo 8 mm long
Week 6: eyes and ear form, embryo known as f etus
Week 7: internal organs, face form, limbs, mouth and tongue, fetus 17mm size. By Week 12: fetus fully form, sex organ develop, fetus starts moving, 56mm long,
By week 20: Hair and nails begins to grow, fingerprint develop, firm hand grip, movement of fetus can be felt, 160m long,
By Week 24: eyelid opens, legal limit for abortion,
By week 26: good chance of survival if prematurely born
By week 28: respond to touch and sound, swallowing amniotic fluid, urinating
By week 30:

Pregnancy Due Date Calculator: Week By Week Calendar, Conception to Birth Pregnancy Due Date Calculator
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 Fetal development entails: All major organs have begun to form. The baby's heart begins to beat. The arms and legs grow longer. Fingers and toes have begun to form. Sex organs begin to form. The face begins to develop features. The umbilical cord is clearly visible. By the end of Week 8, the baby is a fetus, is nearly 1 inch long, and weighs less than ? of an ounce.

Pregnancy Due Date Calculator: Week By Week Calendar, Conception to Birth

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Fetal development entails: All major organs have begun to form. The baby's heart begins to beat. The arms and legs grow longer. Fingers and toes have begun to form. Sex organs begin to form. The face begins to develop features. The umbilical cord is clearly visible. By the end of Week 8, the baby is a fetus, is nearly 1 inch long, and weighs less than ? of an ounce.

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 Some women experience a lot of discomfort, while others feel no discomforts at all. Pregnant women experience pregnancy differently even if they have been pregnant before. Pregnant women may feel completely differently with each subsequent pregnancy. Week 4
Your baby is now an embryo at 1/25 of an inch long and begins to develop: The nervous system (brain and spinal cord)
The heart
Arm and leg buds
Week 8
The embryo begins to develop into a fetus. Fetal development entails: All major organs have begun to form. The baby's heart begins to beat. The arms and legs grow longer. Fingers and toes have begun to form.

Some women experience a lot of discomfort, while others feel no discomforts at all. Pregnant women experience pregnancy differently even if they have been pregnant before. Pregnant women may feel completely differently with each subsequent pregnancy. Week 4
Your baby is now an embryo at 1/25 of an inch long and begins to develop: The nervous system (brain and spinal cord)
The heart
Arm and leg buds
Week 8
The embryo begins to develop into a fetus. Fetal development entails: All major organs have begun to form. The baby's heart begins to beat. The arms and legs grow longer. Fingers and toes have begun to form.

Fetal development: MedlinePlus Medical Encyclopedia Fetal development
Fetal development
Information
Click to Keep Reading
 In your 40th week of pregnancy, it has been 38 weeks since conception, and your baby could be born any day now. Click to Keep Reading
Alternative Names
Expand Section
Zygote; Blastocyst; Embryo; Fetus
Images
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Fetus at 3.5 weeks
Fetus at 7.5 weeks
Fetus at 8.5 weeks
Fetus at 10 weeks
Fetus at 12 weeks
Fetus at 16 weeks
24-week fetus
Fetus at 26 to 30 weeks
Fetus at 30 to 32 weeks
References
Expand Section
Feigelman S, Finkelstein LH. Assessment of fetal growth and development. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed.

In your 40th week of pregnancy, it has been 38 weeks since conception, and your baby could be born any day now. Click to Keep Reading
Alternative Names
Expand Section
Zygote; Blastocyst; Embryo; Fetus
Images
Expand Section
Fetus at 3.5 weeks
Fetus at 7.5 weeks
Fetus at 8.5 weeks
Fetus at 10 weeks
Fetus at 12 weeks
Fetus at 16 weeks
24-week fetus
Fetus at 26 to 30 weeks
Fetus at 30 to 32 weeks
References
Expand Section
Feigelman S, Finkelstein LH. Assessment of fetal growth and development. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed.

The Conception Process The Conception Process
The Conception Process
Sharee Loeffler
 and the endoderm forms the respiratory and gastrointestinal systems. By week two, hormones emanate from the embryo, causing the mother’s menstrual cycle to halt for pregnancy. By the third week, the heartbeat starts. During week four, the brain develops, as well as the eyes, ears, and a mouth opening. The embryo begins pumping its own blood, and arms and legs begin to develop. It is also during this time that the umbilical cord is developed and the placenta begins functioning. The placenta is an organ that supplies developing babies with oxygen and nutrients, and also removes waste as needed. Development continues to take place, and it is usually by week eight that most people begin to refer to the developing life as a “fetus.” It is also during that point that joints form, and the heart beats about 60 times per minute. By Sharee Loeffler | Nov 5, 2015
Sharee Loeffler
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The Conception Process

The Conception Process
The Conception Process
Sharee Loeffler

and the endoderm forms the respiratory and gastrointestinal systems. By week two, hormones emanate from the embryo, causing the mother’s menstrual cycle to halt for pregnancy. By the third week, the heartbeat starts. During week four, the brain develops, as well as the eyes, ears, and a mouth opening. The embryo begins pumping its own blood, and arms and legs begin to develop. It is also during this time that the umbilical cord is developed and the placenta begins functioning. The placenta is an organ that supplies developing babies with oxygen and nutrients, and also removes waste as needed. Development continues to take place, and it is usually by week eight that most people begin to refer to the developing life as a “fetus.” It is also during that point that joints form, and the heart beats about 60 times per minute. By Sharee Loeffler | Nov 5, 2015
Sharee Loeffler
Related posts
Semen Analysis:

Human Fertilization and Embryogenesis - Online Biology Notes Human Fertilization and Embryogenesis
Human Fertilization and Embryogenesis
Human Fertilization and Embryogenesis
Fertilization
Embryogenesis
Summary of embryonic and fetal development
Human Fertilization and Embryogenesis
 Figure: Stages of Human Embryonic development
Summary of embryonic and fetal development
Week 1: fertilization, blastocyst formation, Implantataion
Week2: 3 germ layer differentiate
Week3: beginning of back bone and neural plate (first organ), embryo 2mm size long
Week 4: heart, blood vessel, blood, gut start forming, umbilical cord develop, embryo 5mm size
Week5: brain developing, limb buds, heart beats starts (seen on USG), embryo 8 mm long
Week 6: eyes and ear form, embryo known as f etus
Week 7: internal organs, face form, limbs, mouth and tongue, fetus 17mm size. By Week 12:

Figure: Stages of Human Embryonic development
Summary of embryonic and fetal development
Week 1: fertilization, blastocyst formation, Implantataion
Week2: 3 germ layer differentiate
Week3: beginning of back bone and neural plate (first organ), embryo 2mm size long
Week 4: heart, blood vessel, blood, gut start forming, umbilical cord develop, embryo 5mm size
Week5: brain developing, limb buds, heart beats starts (seen on USG), embryo 8 mm long
Week 6: eyes and ear form, embryo known as f etus
Week 7: internal organs, face form, limbs, mouth and tongue, fetus 17mm size. By Week 12:

Stages of Baby Development From Conception to Birth | Hello Motherhood Stages of Baby Development From Conception to Birth
Stages of Baby Development From Conception to Birth
Conception
Resources for your journey...
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Third Trimester
Birth
 Stages of Baby Development From Conception to Birth | Hello Motherhood
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Stages of Baby Development From Conception to Birth
By: Norma DeVault
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13 June, 2017
Even before most women know they are pregnant, important developments are already taking place. In the week after conception, cell division has resulted in a zygote composed of 100 to 150 cells that are already differentiating and by two weeks the developing embryo has attached to the uterine wall. Phenomenal growth and development continues for nine months and culminates in the birth of a baby. Conception
Out of hundreds of eggs and millions of sperm, one egg and one sperm unite at conception. This union, called fertilization, takes place in the woman’s fallopian tube and the fertilized egg, also called a zygote, divides into approximately 12 to 16 cells on its journey through the fallopian tube to reach and implant in the uterus. Resources for your journey...
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In the first four weeks from conception, fetal growth of the ovum begins with development of the spinal cord, nervous system, gastrointestinal system, heart and lungs. By eight weeks, in the embryonic stage, the face is forming, arms and legs move, the baby’s heart begins beating and the brain and other organs form.

Stages of Baby Development From Conception to Birth | Hello Motherhood

Stages of Baby Development From Conception to Birth
Stages of Baby Development From Conception to Birth
Conception
Resources for your journey...
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 There are small indentations in the head, ready for the development of facial features, eyes, and ears. The outline of the jaw starts to form. 7th Week
This week your baby has an amazing growth spurt. At the beginning of this week, your baby is approximately 4 to 5 mm and by the end of the week it has more than doubled to 11 to 13 mm! Your baby weights approximately 0.03 ounces. Your baby's leg and arm buds are longer now and they have divided into segments where the hands and feet will be. The hands and feet also have an area where the fingers and toes will begin to form. At this point of your pregnancy, the heart is bulging from the body and it has divided into right and left chambers. The brain's hemispheres are continuing to grow and the air passages into the lungs are visible. Your baby's eyes are beginning to get pigment.

There are small indentations in the head, ready for the development of facial features, eyes, and ears. The outline of the jaw starts to form. 7th Week
This week your baby has an amazing growth spurt. At the beginning of this week, your baby is approximately 4 to 5 mm and by the end of the week it has more than doubled to 11 to 13 mm! Your baby weights approximately 0.03 ounces. Your baby's leg and arm buds are longer now and they have divided into segments where the hands and feet will be. The hands and feet also have an area where the fingers and toes will begin to form. At this point of your pregnancy, the heart is bulging from the body and it has divided into right and left chambers. The brain's hemispheres are continuing to grow and the air passages into the lungs are visible. Your baby's eyes are beginning to get pigment.

How an Embryo Grows - dummies How an Embryo Grows
How an Embryo Grows
Credit: Kathryn Born, MA
About the Book Author
 In fact, the embryo begins to perform small, spontaneous movements. If you have an ultrasound examination performed in the first trimester, you can see these spontaneous movements on the screen. The brain enlarges rapidly, and ears and eyes appear. The external genitalia also emerge and can be differentiated as male or female by the end of the 12th week, although sex differences are not yet detectable by ultrasound. By the end of the 12th week, the fetus is about 4 inches long and weighs about 1 ounce. The head looks large and round, and the eyelids are fused shut. The intestines, which protruded slightly into the umbilical cord at about week 10, are by this time well inside the abdomen. Fingernails appear, and hair begins to grow on the baby’s head. The kidneys start working during the third month. Between 9 and 12 weeks, the fetus begins to produce urine, which you can see within the small fetal bladder on ultrasound.

How an Embryo Grows - dummies

How an Embryo Grows
How an Embryo Grows
Credit: Kathryn Born, MA
About the Book Author

In fact, the embryo begins to perform small, spontaneous movements. If you have an ultrasound examination performed in the first trimester, you can see these spontaneous movements on the screen. The brain enlarges rapidly, and ears and eyes appear. The external genitalia also emerge and can be differentiated as male or female by the end of the 12th week, although sex differences are not yet detectable by ultrasound. By the end of the 12th week, the fetus is about 4 inches long and weighs about 1 ounce. The head looks large and round, and the eyelids are fused shut. The intestines, which protruded slightly into the umbilical cord at about week 10, are by this time well inside the abdomen. Fingernails appear, and hair begins to grow on the baby’s head. The kidneys start working during the third month. Between 9 and 12 weeks, the fetus begins to produce urine, which you can see within the small fetal bladder on ultrasound.

My Pregnancy: The Second Trimester (2nd Trimester) | Women's Health articles | Family Health center | SteadyHealth.com My Pregnancy: The Second Trimester (2nd Trimester)
My Pregnancy: The Second Trimester (2nd Trimester)
What Does the Second Trimester Mean for an Expectant Mother?
Fetal Development: Weeks 14-28
What Does an Expectant Mother Experience During the 2nd Trimester?
Maternal Check-up During 2nd Trimester
Recommended Weight Gain for Women During the 2nd Trimester
General Facts About the 2nd Trimester
The End of the 2nd Trimester
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 the spine is becoming stronger and more supple, the spine contains 150 joints, 33 rings and more than 1,000 ligaments. Air sacs of the lungs now form, lungs begin secreting surfactant, eyes begin to open and blink, retinas form and brain wave activity on a fetal scan shows marked response to touch. Fetus is approximately 14 inches in length and weighs around 1.8- 2 pounds. Week 27: brain continues rapid growth, response to sounds grow more consistent, network of nerves to the ear will be completely developed by the end of the month. Lungs continue to grow and prepare for life after delivery. Eyelids are now open more and fetus can differentiate between light and dark, retinas have completely formed. Fetus grows more than an inch this week, average size of 14.4 inches and weight is around 1.9-2 pounds. Week 28: eyebrows and eyelashes are very noticeable, hair on head is growing longer, eyes are completely formed and body is becoming plumper and more rounded.

the spine is becoming stronger and more supple, the spine contains 150 joints, 33 rings and more than 1,000 ligaments. Air sacs of the lungs now form, lungs begin secreting surfactant, eyes begin to open and blink, retinas form and brain wave activity on a fetal scan shows marked response to touch. Fetus is approximately 14 inches in length and weighs around 1.8- 2 pounds. Week 27: brain continues rapid growth, response to sounds grow more consistent, network of nerves to the ear will be completely developed by the end of the month. Lungs continue to grow and prepare for life after delivery. Eyelids are now open more and fetus can differentiate between light and dark, retinas have completely formed. Fetus grows more than an inch this week, average size of 14.4 inches and weight is around 1.9-2 pounds. Week 28: eyebrows and eyelashes are very noticeable, hair on head is growing longer, eyes are completely formed and body is becoming plumper and more rounded.

What is a Fetus? (with pictures) What is a Fetus?
What is a Fetus?
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 January 26, 2021
Most mothers are unable to feel a fetus's movement until around the 20th week of pregnancy. A fetus is an unborn, developing mammal. The fetal stage comes after the embryo stage, after the eighth week of gestation or the 10th week of pregnancy, and lasts until birth. A normally developing embryo will have begun to form major identifying features at the end of the eighth week, such as its nose and mouth. Its organs will also have begun to develop and will continue to do so until it is born. A fetus is an unborn, developing baby. As an embryo develops into a fetus in a pregnant woman, it grows arms and legs and begins to develop fingers and toes. It also begins to grow ears and eyelids. The embryo also begins to form lungs in the eighth week of pregnancy, and its brain continues developing. At this stage in the pregnancy, the embryo is still very small, at less than 0.75 of an inch long.

What is a Fetus? (with pictures)

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January 26, 2021
Most mothers are unable to feel a fetus's movement until around the 20th week of pregnancy. A fetus is an unborn, developing mammal. The fetal stage comes after the embryo stage, after the eighth week of gestation or the 10th week of pregnancy, and lasts until birth. A normally developing embryo will have begun to form major identifying features at the end of the eighth week, such as its nose and mouth. Its organs will also have begun to develop and will continue to do so until it is born. A fetus is an unborn, developing baby. As an embryo develops into a fetus in a pregnant woman, it grows arms and legs and begins to develop fingers and toes. It also begins to grow ears and eyelids. The embryo also begins to form lungs in the eighth week of pregnancy, and its brain continues developing. At this stage in the pregnancy, the embryo is still very small, at less than 0.75 of an inch long.

When Does a Baby Have a Heartbeat During Pregnancy | IYTmed.com When Does a Baby Have a Heartbeat During Pregnancy
When Does a Baby Have a Heartbeat During Pregnancy
Contents
Pregnancy: When does a Baby Have a Heartbeat?
1. The first heart beat
2. Equipment for hearing fetal heartbeat
3. What if you don’t hear/see fetal heartbeat?
What Should a Healthy First Heartbeat Be Like?
1. Heartbeat rate
2. Heartbeat rhythm
Fetal Development: from Conception to Birth
How to Keep the Baby Heart Healthy?
 Week 3
Baby’s spinal column and the worried system form. Other organs like the liver, kidney and intestinal tracts take shape. Week 4
The child is now 10,000 times the size of the egg when it was first fed. Week 5
Baby’s limbs (hands and legs) start to have. Week 6
Brain waves are detectable. The lips, mouth and fingernails develop. Week 7
Baby is swimming and kicking. Eyelids, toes and nose can be seen. Week 8
The bones replace the cartilage, all organs are undamaged, and the finger prints start to form. Baby can hear.

When Does a Baby Have a Heartbeat During Pregnancy | IYTmed.com

When Does a Baby Have a Heartbeat During Pregnancy
When Does a Baby Have a Heartbeat During Pregnancy
Contents
Pregnancy: When does a Baby Have a Heartbeat?
1. The first heart beat
2. Equipment for hearing fetal heartbeat
3. What if you don’t hear/see fetal heartbeat?
What Should a Healthy First Heartbeat Be Like?
1. Heartbeat rate
2. Heartbeat rhythm
Fetal Development: from Conception to Birth
How to Keep the Baby Heart Healthy?

Week 3
Baby’s spinal column and the worried system form. Other organs like the liver, kidney and intestinal tracts take shape. Week 4
The child is now 10,000 times the size of the egg when it was first fed. Week 5
Baby’s limbs (hands and legs) start to have. Week 6
Brain waves are detectable. The lips, mouth and fingernails develop. Week 7
Baby is swimming and kicking. Eyelids, toes and nose can be seen. Week 8
The bones replace the cartilage, all organs are undamaged, and the finger prints start to form. Baby can hear.

Pregnancy Week By Week | babyMed.com Pregnancy Week By Week
Pregnancy Week By Week
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1 Week Pregnant
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Week 3
3 Weeks Pregnant
During the 3rd pregnancy week, the fertilized egg travels trough the fallopian tube. Read More
Week 4
4 Weeks Pregnant
You will likely be expecting your period at the end of this week, but it won't happen if you are pregnant! Read More
Week 5
5 Weeks Pregnant
By week 5, baby is moving along quickly in the growth process and changes are starting to happen. Read More
Week 6
6 Weeks Pregnant
The heart has now started beating and can often be seen early in the 6th week by transvaginal ultrasound. Read More
Week 7
7 Weeks Pregnant
In the 7th week, your baby is still very small, but many of the crucial organs are developing rapidly. Read More
Week 8
8 Weeks Pregnant
In week 8, you are more than halfway through your first trimester and baby continues to grow rapidly. Read More
Week 9
9 Weeks Pregnant
Cartilage develops, bones grow, and baby forms the skeleton that s/he will use to stand, walk and run. Read More
Week 10
10 Weeks Pregnant
Thanks to the ability of the human body to adapt, morning sickness should be easing off by week 10. Read More
Week 11
11 Weeks Pregnant
Your baby is now officially called a fetus, and the most crucial development phases are concluding. Read More
Week 12
12 Weeks Pregnant
Your uterus makes a move upward this week, which (thankfully!)

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Pregnancy Week By Week
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10 Weeks Pregnant-Pregnancy Week-by-Week | Thepregnancyzone 10 Weeks Pregnant
10 Weeks Pregnant
-End of the Embryonic Period!
First medical exam
10 th week of pregnancy symptoms and physical changes that occur in your body
Further hormonal changes
Hearing the baby’s heartbeat for the first time
Your pregnancy becomes more obvious
Sustain your muscle with proper workouts
Care you need to take when you are in week 10 pregnancy
Visit to the dentist
Take care of your comfort
It’s normal to feel tired
No stress
Changes that occur in the fetus when you are 10 weeks pregnant
End of the embryonic stage
First sign of activity in major organs
Health and safety tips for pregnancy week 10
More tests
No smoking
Positive attitude and relaxation
 Your baby’s major organic systems emerge along with the working of digestive tract which is able to move the food all the way through its bowels. By this week, your baby will get verifiable toes and fingers. Baby’s eyelids will fuse and remain shut until the weeks of 25-27. The upper lip appears completely and the external genitals begin to appear. Skeleton bones grow rapidly and the eyelids develop. End of the embryonic stage
When you are in week 10, it is considered as the end of the embryonic period, and the embryo acquires human appearance and from the next week onwards, your baby is considered as a fetus. First sign of activity in major organs
During pregnancy week 10, internal organs start to develop and the essential organs like liver, kidney, brain and intestine start to function. The spine is very visible and the spinal nerves are spreading and start working during this week. Your baby will now start growing in length faster than before and will also begin to swallow the amniotic fluid which surrounds it. This week marks the beginning of the hair growth for your baby.

10 Weeks Pregnant-Pregnancy Week-by-Week | Thepregnancyzone

10 Weeks Pregnant
10 Weeks Pregnant
-End of the Embryonic Period!
First medical exam
10 th week of pregnancy symptoms and physical changes that occur in your body
Further hormonal changes
Hearing the baby’s heartbeat for the first time
Your pregnancy becomes more obvious
Sustain your muscle with proper workouts
Care you need to take when you are in week 10 pregnancy
Visit to the dentist
Take care of your comfort
It’s normal to feel tired
No stress
Changes that occur in the fetus when you are 10 weeks pregnant
End of the embryonic stage
First sign of activity in major organs
Health and safety tips for pregnancy week 10
More tests
No smoking
Positive attitude and relaxation

Your baby’s major organic systems emerge along with the working of digestive tract which is able to move the food all the way through its bowels. By this week, your baby will get verifiable toes and fingers. Baby’s eyelids will fuse and remain shut until the weeks of 25-27. The upper lip appears completely and the external genitals begin to appear. Skeleton bones grow rapidly and the eyelids develop. End of the embryonic stage
When you are in week 10, it is considered as the end of the embryonic period, and the embryo acquires human appearance and from the next week onwards, your baby is considered as a fetus. First sign of activity in major organs
During pregnancy week 10, internal organs start to develop and the essential organs like liver, kidney, brain and intestine start to function. The spine is very visible and the spinal nerves are spreading and start working during this week. Your baby will now start growing in length faster than before and will also begin to swallow the amniotic fluid which surrounds it. This week marks the beginning of the hair growth for your baby.

26 Weeks Pregnant: Baby Development, Symptoms, and More Week 26 of Your Pregnancy
Week 26 of Your Pregnancy
Your Baby's Development at 26 Weeks
Eyes
Reflexes
Reproductive System
Intestines
Survival Outside the Womb
Stay Calm Mom: Episode 3
How Will Pregnancy Change My Body?
Your Common Symptoms This Week
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A Word From Verywell
 6 months and 2 weeks
Which Trimester? Second trimester
How Many Weeks to Go? 14 weeks
Your Baby's Development at 26 Weeks
At 26 weeks, a baby is almost 9 1/4 inches (23.4 centimeters) from the top of their head to the bottom of the buttocks (known as the crown-rump length ), and baby's height is about 13 inches (33.3 centimeters) from the top of the head to the heel (crown-heel length). 1  This week, baby weighs just about 32 ounces or 2 pounds (902 grams). 2
Verywell / Bailey Mariner
The 7 Best Sesame Street Toys of 2021
Eyes
All the parts of your baby's eyes are formed. Your baby even has visible eyebrows and eyelashes. 3
Reflexes
Baby is beginning to display the startle or moro reflex as well as the palmer (hand) and plantar (foot) grasp, all reflexes you'll see them perform as newborns. 4
Reproductive System
If you’re carrying a boy, the testicles may begin to descend into the scrotum this week. 5
Intestines
Your baby's intestines also continue to grow and develop. They are absorbing more and more nutrients from the amniotic fluid and producing enzymes to break down nutrients such as sugars, proteins, and fats for digestion.

26 Weeks Pregnant: Baby Development, Symptoms, and More

Week 26 of Your Pregnancy
Week 26 of Your Pregnancy
Your Baby's Development at 26 Weeks
Eyes
Reflexes
Reproductive System
Intestines
Survival Outside the Womb
Stay Calm Mom: Episode 3
How Will Pregnancy Change My Body?
Your Common Symptoms This Week
Rib Pain
Stretch Marks
Self-Care Tips
Dealing With Rib Pain
Dealing With Stretch Marks
Consider a Birth Plan
What Experts Say
Your Week 26 Checklist
Advice for Partners
Upcoming Doctor’s Visits
Recommended Products
Special Considerations
Gestational Diabetes
A Word From Verywell

6 months and 2 weeks
Which Trimester? Second trimester
How Many Weeks to Go? 14 weeks
Your Baby's Development at 26 Weeks
At 26 weeks, a baby is almost 9 1/4 inches (23.4 centimeters) from the top of their head to the bottom of the buttocks (known as the crown-rump length ), and baby's height is about 13 inches (33.3 centimeters) from the top of the head to the heel (crown-heel length). 1  This week, baby weighs just about 32 ounces or 2 pounds (902 grams). 2
Verywell / Bailey Mariner
The 7 Best Sesame Street Toys of 2021
Eyes
All the parts of your baby's eyes are formed. Your baby even has visible eyebrows and eyelashes. 3
Reflexes
Baby is beginning to display the startle or moro reflex as well as the palmer (hand) and plantar (foot) grasp, all reflexes you'll see them perform as newborns. 4
Reproductive System
If you’re carrying a boy, the testicles may begin to descend into the scrotum this week. 5
Intestines
Your baby's intestines also continue to grow and develop. They are absorbing more and more nutrients from the amniotic fluid and producing enzymes to break down nutrients such as sugars, proteins, and fats for digestion.

6 Weeks Pregnant - Your Baby & You | Week by Week Advice 6 Weeks Pregnant
6 Weeks Pregnant
-Most Severe Period for Pregnancy Symptoms!
6 th week of pregnancy symptoms and physical changes that occur in your body
In order to get relief from symptoms of 6 weeks pregnancy:
Changes that occur in the fetus when you are 6 weeks pregnant
Facts of pregnancy week 6
 The brain of your 6 week fetus develops into 3 different parts. First is forebrain, which is for memory and reasoning, second is midbrain, which is for translating messages from brain to other organs and limbs, and the third is hindbrain, which is for regulating baby’s breathing and for muscle movements. During 6 weeks pregnancy, your baby is of about 0.08 to 0.2 inches long and becomes thrice in its weight. It’s measured from head to the buttocks and is known as the “crown-rump length”. The physical features of your baby start to show this week and are wholly surrounded by the amniotic sac. Your baby’s heart starts beating and it will be detected in the ultrasound scan. Heart beats about 100-140 beats per minute, about twice as much as an adult’s. Digestive and respiratory systems also begin to develop. Small buds that later become arms and legs also begin to appear this week. The trunk and neck of your baby begin to develop.

6 Weeks Pregnant - Your Baby & You | Week by Week Advice

6 Weeks Pregnant
6 Weeks Pregnant
-Most Severe Period for Pregnancy Symptoms!
6 th week of pregnancy symptoms and physical changes that occur in your body
In order to get relief from symptoms of 6 weeks pregnancy:
Changes that occur in the fetus when you are 6 weeks pregnant
Facts of pregnancy week 6

The brain of your 6 week fetus develops into 3 different parts. First is forebrain, which is for memory and reasoning, second is midbrain, which is for translating messages from brain to other organs and limbs, and the third is hindbrain, which is for regulating baby’s breathing and for muscle movements. During 6 weeks pregnancy, your baby is of about 0.08 to 0.2 inches long and becomes thrice in its weight. It’s measured from head to the buttocks and is known as the “crown-rump length”. The physical features of your baby start to show this week and are wholly surrounded by the amniotic sac. Your baby’s heart starts beating and it will be detected in the ultrasound scan. Heart beats about 100-140 beats per minute, about twice as much as an adult’s. Digestive and respiratory systems also begin to develop. Small buds that later become arms and legs also begin to appear this week. The trunk and neck of your baby begin to develop.

Your Body throughout Pregnancy Slideshow
|
Your Body throughout Pregnancy

Slideshow | Your Body throughout Pregnancy
Your Body Before Pregnancy
Your Body at 6-7 Weeks of Pregnancy
Your Body at 12 Weeks of Pregnancy
Your Body at 20 Weeks of Pregnancy
Your Body at 28 Weeks of Pregnancy
Your Body at 36 Weeks of Pregnancy
Your Body at 40 Weeks of Pregnancy (Internal)
Your Body at 40 Weeks of Pregnancy (External)
 Each lobe connects to a lactiferous duct for conveying milk. As the ducts extend toward the nipple and areola (darker area around the nipple), they widen into the lactiferous sinuses. These sinuses (or milk pools) release the milk through 15 to 20 tiny nipple openings in each breast when the baby nurses. At week 28, the fetus is about 16 inches long and weighs two to three pounds. The skin is wrinkled but will become less so as more fat builds up under the skin in the next few weeks. Fine, downy hair called lanugo, and a waxy white protective substance covering the skin called vernix, are on the fetus’ body. Its eyes are open, and eyebrows and eyelashes were formed in the fourth month. The fetus sucks its thumb and its taste buds have developed. It kicks, stretches and moves frequently in your uterus—you’ll feel it moving around and others might even be able to see these movements! Fetal organs and systems are quite well developed by the 28th week of pregnancy, but the final two months of gestation are important for further maturation of all body systems and organs.

Your Body throughout Pregnancy

Slideshow
|
Your Body throughout Pregnancy

Slideshow | Your Body throughout Pregnancy
Your Body Before Pregnancy
Your Body at 6-7 Weeks of Pregnancy
Your Body at 12 Weeks of Pregnancy
Your Body at 20 Weeks of Pregnancy
Your Body at 28 Weeks of Pregnancy
Your Body at 36 Weeks of Pregnancy
Your Body at 40 Weeks of Pregnancy (Internal)
Your Body at 40 Weeks of Pregnancy (External)

Each lobe connects to a lactiferous duct for conveying milk. As the ducts extend toward the nipple and areola (darker area around the nipple), they widen into the lactiferous sinuses. These sinuses (or milk pools) release the milk through 15 to 20 tiny nipple openings in each breast when the baby nurses. At week 28, the fetus is about 16 inches long and weighs two to three pounds. The skin is wrinkled but will become less so as more fat builds up under the skin in the next few weeks. Fine, downy hair called lanugo, and a waxy white protective substance covering the skin called vernix, are on the fetus’ body. Its eyes are open, and eyebrows and eyelashes were formed in the fourth month. The fetus sucks its thumb and its taste buds have developed. It kicks, stretches and moves frequently in your uterus—you’ll feel it moving around and others might even be able to see these movements! Fetal organs and systems are quite well developed by the 28th week of pregnancy, but the final two months of gestation are important for further maturation of all body systems and organs.

The Fetal Period | Boundless Anatomy and Physiology The Fetal Period
The Fetal Period
Fetal Development
Learning Objectives
Key Takeaways
Key Points
Key Terms
Teratogens
Learning Objectives
Key Takeaways
Key Points
Key Terms
Characteristics of Teratogens
Example Teratogens
Prenatal Diagnostic Tests
Learning Objectives
Key Takeaways
Key Points
Key Terms
Prenatal Screening Overview
Invasive and Noninvasive Prenatal Screening
Determination of Gestational Age
 The kidneys produce urine, and the liver makes bile. In boys, the prostate gland develops, while in girls the ovaries move from the abdomen to the pelvis. Weeks 15 to 16: The heart pumps out 25 quarts of blood a day and the fetal structures are looking more normal. Week 17: The fetus start to move its joints and the retina becomes sensitive to light. It weighs about five ounces. Week 18: The fetus starts to hear and is startled by noise. Its skin is starting to grow a protective, wax-like layer and tiny air spaces begin to form in the lungs and the vocal cords.

The Fetal Period | Boundless Anatomy and Physiology

The Fetal Period
The Fetal Period
Fetal Development
Learning Objectives
Key Takeaways
Key Points
Key Terms
Teratogens
Learning Objectives
Key Takeaways
Key Points
Key Terms
Characteristics of Teratogens
Example Teratogens
Prenatal Diagnostic Tests
Learning Objectives
Key Takeaways
Key Points
Key Terms
Prenatal Screening Overview
Invasive and Noninvasive Prenatal Screening
Determination of Gestational Age

The kidneys produce urine, and the liver makes bile. In boys, the prostate gland develops, while in girls the ovaries move from the abdomen to the pelvis. Weeks 15 to 16: The heart pumps out 25 quarts of blood a day and the fetal structures are looking more normal. Week 17: The fetus start to move its joints and the retina becomes sensitive to light. It weighs about five ounces. Week 18: The fetus starts to hear and is startled by noise. Its skin is starting to grow a protective, wax-like layer and tiny air spaces begin to form in the lungs and the vocal cords.

Your Body throughout Pregnancy Slideshow
|
Your Body throughout Pregnancy

Slideshow | Your Body throughout Pregnancy
Your Body Before Pregnancy
Your Body at 6-7 Weeks of Pregnancy
Your Body at 12 Weeks of Pregnancy
Your Body at 20 Weeks of Pregnancy
Your Body at 28 Weeks of Pregnancy
Your Body at 36 Weeks of Pregnancy
Your Body at 40 Weeks of Pregnancy (Internal)
Your Body at 40 Weeks of Pregnancy (External)
 The embryo is about 1/4 inch to 1/2 inch long and weighs 1/1,000th of an ounce. The embryo’s head is large in proportion to the rest of the body. The internal organs are forming and the heart has been beating since the end of the 4th week. The embryo is floating in the amniotic sac. Buds for the arms and legs emerge in the 5th week and, by the 7th week, buds for fingers and toes also appear. The umbilical cord is lengthening and will continue to grow, allowing the fetus freedom to move. The 7th week represents a milestone in development: the embryo is now considered a fetus. Previous | Next
Your Body at 12 Weeks of Pregnancy
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Your Body at 12 Weeks of Pregnancy
At the 12th week of pregnancy, the placenta is much larger. It now produces the hormones needed to sustain the pregnancy.

Your Body throughout Pregnancy

The embryo is about 1/4 inch to 1/2 inch long and weighs 1/1,000th of an ounce. The embryo’s head is large in proportion to the rest of the body. The internal organs are forming and the heart has been beating since the end of the 4th week. The embryo is floating in the amniotic sac. Buds for the arms and legs emerge in the 5th week and, by the 7th week, buds for fingers and toes also appear. The umbilical cord is lengthening and will continue to grow, allowing the fetus freedom to move. The 7th week represents a milestone in development: the embryo is now considered a fetus. Previous | Next
Your Body at 12 Weeks of Pregnancy
Next Image
Your Body at 12 Weeks of Pregnancy
At the 12th week of pregnancy, the placenta is much larger. It now produces the hormones needed to sustain the pregnancy.

Human Fertilization and Embryogenesis - Online Biology Notes Human Fertilization and Embryogenesis
Human Fertilization and Embryogenesis
Human Fertilization and Embryogenesis
Fertilization
Embryogenesis
Summary of embryonic and fetal development
Human Fertilization and Embryogenesis
 fetus fully form, sex organ develop, fetus starts moving, 56mm long,
By week 20: Hair and nails begins to grow, fingerprint develop, firm hand grip, movement of fetus can be felt, 160m long,
By Week 24: eyelid opens, legal limit for abortion,
By week 26: good chance of survival if prematurely born
By week 28: respond to touch and sound, swallowing amniotic fluid, urinating
By week 30: head lying down, 240 mm long
Week 40: birth
Human Fertilization and Embryogenesis
embryonic development in human
fertilization in human
fetus
gastulation
human fertilization and embryogenesis
implantation

fetus fully form, sex organ develop, fetus starts moving, 56mm long,
By week 20: Hair and nails begins to grow, fingerprint develop, firm hand grip, movement of fetus can be felt, 160m long,
By Week 24: eyelid opens, legal limit for abortion,
By week 26: good chance of survival if prematurely born
By week 28: respond to touch and sound, swallowing amniotic fluid, urinating
By week 30: head lying down, 240 mm long
Week 40: birth
Human Fertilization and Embryogenesis
embryonic development in human
fertilization in human
fetus
gastulation
human fertilization and embryogenesis
implantation

8 Weeks Pregnant | 8th Week of Pregnancy Symptoms 8 Weeks Pregnant
8 Weeks Pregnant
-Time for Formation of Four Chambers in Your Baby’s Heart!
8 th week of pregnancy symptoms and physical changes that occur in your body
Digestive process slows down
Annoying skin issues
Uterus growth and related changes
The debut of pregnancy back pain
Feeling sleepy and nauseated
Care you need to take when you are 8 weeks pregnant
Changes that occur in the fetus when you are in week 8 of pregnancy
Brain formation and nerve development
4 chambers heart
Beginning of the arms and legs
Internal organs
Muscle contractions
Healthy and safety tips for pregnancy week 8
Prenatal tests
 Changes that occur in the fetus when you are in week 8 of pregnancy
Brain formation and nerve development
Your baby’s head becomes slightly big because of the rapid brain development. The neural tube is now completely closed and the brain forms distinct regions with some of the nerves being visible during an 8 weeks pregnant ultrasound. 4 chambers heart
The heart of the 8 week fetus starts to break into four chambers and beats with 150 beats /minute, almost twice yours does. The blood circulation is increasing exponentially during this week inside the body of the little one. Beginning of the arms and legs
Upper limbs are similar to the paddles. The arms divide in two segments and the elbow is visible too. The foot plates, with the slight beginning of toe rays, form within the next few days. By the end of this week, external ears will also appear. Internal organs
The formation of intestines also takes place within the umbilical cord. Later they will migrate into the abdominal cavity.

8 Weeks Pregnant | 8th Week of Pregnancy Symptoms

8 Weeks Pregnant
8 Weeks Pregnant
-Time for Formation of Four Chambers in Your Baby’s Heart!
8 th week of pregnancy symptoms and physical changes that occur in your body
Digestive process slows down
Annoying skin issues
Uterus growth and related changes
The debut of pregnancy back pain
Feeling sleepy and nauseated
Care you need to take when you are 8 weeks pregnant
Changes that occur in the fetus when you are in week 8 of pregnancy
Brain formation and nerve development
4 chambers heart
Beginning of the arms and legs
Internal organs
Muscle contractions
Healthy and safety tips for pregnancy week 8
Prenatal tests

Changes that occur in the fetus when you are in week 8 of pregnancy
Brain formation and nerve development
Your baby’s head becomes slightly big because of the rapid brain development. The neural tube is now completely closed and the brain forms distinct regions with some of the nerves being visible during an 8 weeks pregnant ultrasound. 4 chambers heart
The heart of the 8 week fetus starts to break into four chambers and beats with 150 beats /minute, almost twice yours does. The blood circulation is increasing exponentially during this week inside the body of the little one. Beginning of the arms and legs
Upper limbs are similar to the paddles. The arms divide in two segments and the elbow is visible too. The foot plates, with the slight beginning of toe rays, form within the next few days. By the end of this week, external ears will also appear. Internal organs
The formation of intestines also takes place within the umbilical cord. Later they will migrate into the abdominal cavity.

Ultrasound at 8 Weeks: What to Expect - New Kids Center Ultrasound at 8 Weeks: What to Expect
Ultrasound at 8 Weeks: What to Expect
Why May You Need to Do an Ultrasound at 8 Weeks?
What Happens at the 8 Week Ultrasound?
How Is Your Baby Developing at Week 8 – Gestational Age/Fetal Age 6 Weeks
Pictures of 8 Week Ultrasound
More Notes on Your hCG Level at 8 Week Pregnancy
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How Is Your Baby Developing at Week 8 – Gestational Age/Fetal Age 6 Weeks
At this point everything that an adult human has is now present in the embryo. This means that it is no longer an embryo and can be called a fetus. A strong fetal heartbeat should be clear on the ultrasound, and the heart rate should reach between 140 and 170 beats per minute by the 9 th week of gestation. Those who do not have a strong heartbeat will need to have a follow-up ultrasound to confirm the diagnosis because the fetus may not be viable. In this case, you will have two options: to miscarry naturally when the time comes, or to undergo a procedure called dilation and curettage, or D&C. About half of women who go through this kind of early pregnancy loss opt to miscarry naturally, while the other half opt for the D&C.
At this point, the baby already has tiny arms and legs, as well as buds where the hands and feet will be. It’s about 18 mm in length, the face is starting to take shape, and the internal organs are forming.

Ultrasound at 8 Weeks: What to Expect - New Kids Center

Ultrasound at 8 Weeks: What to Expect
Ultrasound at 8 Weeks: What to Expect
Why May You Need to Do an Ultrasound at 8 Weeks?
What Happens at the 8 Week Ultrasound?
How Is Your Baby Developing at Week 8 – Gestational Age/Fetal Age 6 Weeks
Pictures of 8 Week Ultrasound
More Notes on Your hCG Level at 8 Week Pregnancy

To avoid this, cancel and sign in to YouTube on your computer. Cancel
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Share
Include playlist
An error occurred while retrieving sharing information. Please try again later. Watch later
Share
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Watch on
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How Is Your Baby Developing at Week 8 – Gestational Age/Fetal Age 6 Weeks
At this point everything that an adult human has is now present in the embryo. This means that it is no longer an embryo and can be called a fetus. A strong fetal heartbeat should be clear on the ultrasound, and the heart rate should reach between 140 and 170 beats per minute by the 9 th week of gestation. Those who do not have a strong heartbeat will need to have a follow-up ultrasound to confirm the diagnosis because the fetus may not be viable. In this case, you will have two options: to miscarry naturally when the time comes, or to undergo a procedure called dilation and curettage, or D&C. About half of women who go through this kind of early pregnancy loss opt to miscarry naturally, while the other half opt for the D&C.
At this point, the baby already has tiny arms and legs, as well as buds where the hands and feet will be. It’s about 18 mm in length, the face is starting to take shape, and the internal organs are forming.

What Does the Baby Look Like in the Womb at 17 Weeks Pregnant? | Hello Motherhood What Does the Baby Look Like in the Womb at 17 Weeks Pregnant?
What Does the Baby Look Like in the Womb at 17 Weeks Pregnant?
History
Resources for your journey...
Growth
External Appearance
Internal Development
Signifiance
 the mesoderm, or middle layer and the endoderm, or outside layer. All the genetic material to create the fetus at 17 weeks are already present. Resources for your journey...
Due Date Calculator
Historical Figures Quiz
Zodiac Center
Baby Name Swiper
Celebrities Quiz
Discover your zodiac sign with our fun tool! Growth
Stages of Baby Development From Conception to Birth
Learn More
The fetus at 17 weeks measures around 9 inches long, 5 inches from crown to rump and weighs about 5 ounces. While this may not seem like much, it’s a far cry from the embryo that was the size of a pinpoint just 13 weeks before. External Appearance
In many ways, the 17-week fetus looks quite complete. Arms, legs, fingers and toes are developed. The eyes have developed to the point where the retina is sensitive to light. But the eyelids are still sealed and will be until around the 22nd week. The skin is very thin, and blood vessels are visible beneath the surface;

What Does the Baby Look Like in the Womb at 17 Weeks Pregnant? | Hello Motherhood

What Does the Baby Look Like in the Womb at 17 Weeks Pregnant?
What Does the Baby Look Like in the Womb at 17 Weeks Pregnant?
History
Resources for your journey...
Growth
External Appearance
Internal Development
Signifiance

the mesoderm, or middle layer and the endoderm, or outside layer. All the genetic material to create the fetus at 17 weeks are already present. Resources for your journey...
Due Date Calculator
Historical Figures Quiz
Zodiac Center
Baby Name Swiper
Celebrities Quiz
Discover your zodiac sign with our fun tool! Growth
Stages of Baby Development From Conception to Birth
Learn More
The fetus at 17 weeks measures around 9 inches long, 5 inches from crown to rump and weighs about 5 ounces. While this may not seem like much, it’s a far cry from the embryo that was the size of a pinpoint just 13 weeks before. External Appearance
In many ways, the 17-week fetus looks quite complete. Arms, legs, fingers and toes are developed. The eyes have developed to the point where the retina is sensitive to light. But the eyelids are still sealed and will be until around the 22nd week. The skin is very thin, and blood vessels are visible beneath the surface;