How can women deliver twins? how does the fertilisation differ from single child to twins/triplets?
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Naturally, twins come from two possible sources. A woman might spontaneously release two eggs in lieu of one during ovulation. Those two eggs might become independently fertilized by different sperm and grow into two different babies. These are called “fraternal twins” and are technically just siblings who shared a womb for 9 months. Genetically they are just like siblings.
Alternatively a single fertilized egg might spontaneously split resulting in the multiple embryos, if the split is complete you’d get conjoined, or attached, twins and if it’s complete you get identical twins. In the case of identical twins the children are genetically identical at the moment of the split but might experience mutations or slight changes after that point.
In a world with medical pregnancy assistance women can take drugs that increase fertility, meaning they release more eggs, this means sometimes you get an increased likelihood of fraternal twins, or triplets, or quadruplets etc. if the woman releases several eggs during ovulation.
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