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The first stage of labor--contractions make the cervix dilate
contractions make the cervix dilate -
This is called EFFACEMENT
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Transition--the cervix becomes fully dilated to 10 cm
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Baby's head slips out of uterus into birth canal
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The top of the head appears at the opening of the birth canal.
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Head emerges followed by the shoulders
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Rest of the baby follows easily.
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Woman gives birth to placenta.