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Though most twin pregnancies still result from natural fertilization, an increase in IVF has made them more prevalent over the last several decades. From conception to delivery, there are some significant differences between singleton and twin pregnancies. Mother and babies are at risk for additional complications and require increased monitoring.

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1. Fraternal Twins

Fraternal or dizygotic twins occur when two separate sperm fertilize two separate eggs that implant at the same time. Pregnancies with fraternal twins always have two placentas and two amniotic sacs. Genetically, the children are no more similar looking than siblings born years apart and can be of the same or different sexes.

Fraternal Twins Boy Girl katrinaelena / Getty Images
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