Twin - Wikipedia
https://en.wikipedia.org/wiki/Twin
OverviewStatisticsTypes and zygosityDegree of separationDemographicsDelivery intervalComplications during pregnancyManagement of birthTwins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell. Since identical twins develop from one zygote, they will share the same sex, while fraternal twins may or may not. In rare cases twins can have the …
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