How can doctors tell if you are having identical twins from an ultrasound?
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Identical twins happen when a single fertilised egg splits into two babies– they will share a baby sac.
Fraternal twins happen when two separate sperm cells fertilize two released egg cells, creating 2 separate baby sacs growing side by side.
This happens largely based on which parent is carrying the “twin” gene. If the mother’s parent was a twin, there’s a chance that she releases two mature eggs every month, and fraternal twins are likely. If the twin gene is running on the father’s side, his swimmers could be set to split once they reach their target, creating identical twins. (This explanation is very basic and there are exceptions to everything, but I studied a lot about twins because my dad is one.)
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