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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.
When a baby is born before the 37th week of pregnancy, it is called a preterm delivery. Some preterm births happen on their own -- a mother goes into labor and her baby comes early. In other cases, problems with the pregnancy prompt doctors to deliver a baby earlier than planned. About three quarters of preterm births are spontaneous and about one quarter occur because of medical complications.