Cervix thins and dilates during labor. As your baby moves through your pelvis, her head usually rotates to face your spine.As your uterus pushes your baby through your pelvis, her head begins to show, or "crown."After most of your baby's head is born, her shoulders move through your pelvis and she begins to rotate again.After your baby's head and shoulders are born, the rest of her body slips out.
Allina Health's Patient Education Department, Beginnings: Pregnancy, Birth and Beyond, seventh edition, ob-ah-90026
Allina Health's Patient Education Department experts