The baby’s head, face, and chin appear outside the mother. The baby’s head must extend back to accommodate the upward curvature of the birth canal. Extension: Usually, the back of the baby’s head is against the mother’s pubic bone as it passes through the vaginal opening.Usually, the baby faces down toward the mother’s spine, although sometimes the baby faces the mother’s pubic bone. The baby’s head rotates to accommodate these changes in the diameter of the mother’s pelvis. Now, with the baby reaching the mother’s pelvic floor, the widest diameter of the mother’s pelvis is from front to back. Internal Rotation: When the baby’s head enters the mother’s pelvis (engagement), the widest diameter of the mother’s pelvis is from right to left. ![]() As the baby’s head meets resistance from the soft tissue of the mother’s pelvis, the baby’s head flexes downward so that the baby’s chin touches the baby’s chest.
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