How is multiple gestation pregnancy different than a single gestation pregnancy?

Multiple gestation occurs when a single fertilized egg divides into two embryos or when multiple eggs are fertilized at once, according to the American Society for Reproductive MedicineOff Site Icon (ASRM).

These types of fertilization are monozygotic and dizygotic, according to the National Institutes of HealthOff Site Icon. Monozygotic fertilization occurs when one egg divides into multiple embryos; dizygotic fertilization happens when multiple eggs are fertilized at once.

In 2/3 of the cases, a monozygotic gestation produces embryos that share the same placenta; this is call a monochorionic twin pregnancy. This is a special concern for health care providers, as multiple embryos sharing the same placenta can increase complications of the pregnancy and are high risk, according to the American Congress of Obstetricians and GynecologistsOff Site Icon.

For more information about the differences between single and multiple gestation pregnancies, talk to your doctor.

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