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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.
Friedman's original research in 1955 defined the following three stages of labor: 1  The first stage starts with uterine contractions leading to complete cervical dilation and is divided into latent and active phases. 2  The second stage of labor is defined as complete dilation of the cervix to the delivery of the infant.