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During pregnancy, a woman's uterus houses and protects the developing fetus. After approximately 40 weeks, the fetus reaches full term and is ready to be born.

At the time of delivery, the opening to the uterus, called the cervix, dilates to allow the baby to pass from the uterus into the vagina. The vagina is a muscular tube that expands to accommodate the head and shoulders of the baby while uterine contractions continue to push ... more