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Worldwide about 1 in 90 human births (1.1%) results from a twin pregnancy, but it isn't as simple as that as there are different ways that twins are formed in the womb. Fraternal Twins Fraternal twins occur when two separate eggs are fertilised by two different sperm causing two zygotes which is where the term dizygotic comes from (di=two, zygotic=zygotes). The two zygotes are the first cells that will go on to create your two babies, who have their own sets of DNA. They can be any combination of girl-girl, boy-boy or girl-boy. Fraternal twins will always have their own placentas, amniotic sacs and chorions; however, occasionally the placentas can fuse during pregnancy and appear to be one. Fraternal twins are more common if the twins’ mother: has a history of twins in her family, is over 35 years old, has already had several babies, and/or has been taking fertility drugs. As fraternal twins are caused by the release and fertilisation of two eggs,...