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11.
July 2015

FAQ188, July 2015

How does multiple pregnancy occur? A twin, triplet, or higher-order pregnancy (four or more babies) is called multiple pregnancy. If more than one egg is released during the menstrual cycle and each is fertilized by a sperm, more than one embryo may implant and grow in your uterus. This type of pregnancy results in fraternal twins (or more). When a single fertilized egg splits, it results in multiple identical embryos. This type of pregnancy results in identical twins (or more). Identical twins are less common than fraternal twins.


FAQ006, May 2015

What is cesarean birth? Cesarean birth is the delivery of a baby through incisions made in the mother's abdomen and uterus.


FAQ004, May 2011

What happens when labor begins? As labor begins, the cervix opens (dilates). The uterus, which contains muscle, contracts at regular intervals. When it contracts, the abdomen becomes hard. Between the contractions, the uterus relaxes and becomes soft. Up to the start of labor and during early labor, the baby will continue to move.


American College of Obstetricians and Gynecologists
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