Final answer:
The cervix needs to dilate from 8 cm to 10 cm to start the second stage of labor.
Explanation:
To start the second stage of labor, the cervix needs to dilate from 8 cm to 10 cm.
In the transition phase of labor, the cervix dilates from 8-10 centimeters, which signals the beginning of the second stage, where the baby is expelled from the uterus.
Cervical dilation is essential for the delivery of the baby and placenta during birth.
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