Twins can be the same (identical-monozygotic) or different (fraternal-dizygotic). Fraternal twins, triplets, or more develop when two or more eggs are fertilized by separate sperm. Fraternal fetuses have separate placentas and amniotic sacs (the bag containing the fluid around a baby). Identical twins come from a single egg that has been fertilized by one sperm. For unknown reasons, the fertilized egg splits into two or more embryos during the first stage of development. Some identical twins share the same placenta. However, they usually grow within separate amniotic sacs in the uterus. In rare cases, identical twins share one amniotic sac (monoamniotic). Fraternal multiples: 1. Can be of different sexes and may have different blood types. 2. They may look very diffe View the rest of this article
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