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However, you can know the stages of the birth process and what to generally expect. Childbirth usually occurs in three stages: First stage: The time of the onset of true labor until the cervix is completely dilated to 10 cm. Second stage: The period after the cervix is dilated to 10 cm until the baby is delivered.
Throughout this chapter, we will express embryonic and fetal ages in terms of weeks from fertilization, commonly called conception. The period of time required for full development of a fetus in utero is referred to as gestation (gestare = âto carryâ or âto bearâ).