You are an AI Assistant.
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You are an AI assistant. You will be given a task. You must generate a detailed and long answer.
Input:
What is the missing first step of the following process:  -  Babies become infants - Infants become children - Children learn skills - Children become teenagers - Teenagers undergo puberty - Teenagers become adults - Adults have children - Adults become elderly - Elderly humans die.
The answer to this question is:
user
The missing first step of the given process is: "Human conception and pregnancy."

To provide a comprehensive understanding of this stage, I will explain it in detail:

Human conception and pregnancy mark the beginning of the human life cycle. It is a crucial step before babies are born and develop into infants. This miraculous process starts with the fusion of male and female reproductive cells called sperm and egg, respectively. The fusion of these cells results in the formation of a zygote, which is a single cell containing the genetic information needed to develop a new human being.

The zygote then undergoes multiple cell divisions, ultimately forming a blastocyst - a structure with an outer layer that will become the placenta (providing nutrients to the growing baby) and an inner cell mass that will develop into the embryo. Around one week after fertilization, the blastocyst implants itself into the uterine wall, and the placenta begins to form. This marks the beginning of the pregnancy.

Over the next several weeks, the embryo will further differentiate and develop into distinct structures. Around the 10th week of pregnancy, the embryo has grown sufficiently and is now referred to as a fetus. The supporting structures, like the amniotic sac and umbilical cord, are in place to support the fetus.

Throughout the stages of pregnancy, there are three trimesters, each characterized by specific fetal growth and development milestones. In the first trimester, various organ systems start forming, and the fetus develops most of its external features, such as limbs, facial structures, and the nervous system. In the second trimester, the fetus continues to grow, and its organs and systems mature, enabling it to perform necessary functions to survive outside the womb. By the third trimester, the fetus gains weight, and its organs reach the final stage of development.

After approximately nine months of development, the baby is born through the process of childbirth, either vaginally or by cesarean section. The baby is then considered a newborn and will progress to the next stage of the life cycle, transforming from a newborn to an infant. From this point onwards, the baby will undergo a series of growth and development stages, as originally mentioned in the question.
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