The first stage of labor, when the cervix widens enough to allow the baby to emerge, is called:

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The first stage of labor is characterized by the process of dilation and effacement of the cervix. This is when the cervix opens (dilates) and thins (effaces) in preparation for delivery. Expulsion refers to the second stage of labor when the baby's head emerges, crowning refers to the point when the baby's head is visible, and delivery refers to the entire process of the baby being born, including both the first and second stages of labor.

The First Stage of Labor, When the Cervix Widens Enough