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Baby Center on MSNHere's what it means to have di-di twinsThey each have their own placenta and amniotic sac. Most di-di twins are fraternal, but they can be identical. A first-trimester ultrasound will confirm you're having di-di twins by showing two ...
Fraternal or dizygotic twins develop from two different eggs fertilized by separate sperm; they generally share about 50 percent of their genes. Therefore, fraternal twins are essentially like ...
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