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Identical twins are born when a single fertilized egg splits and develops into two fetuses. Fraternal twins are born when two separate eggs are released and fertilized.

Identical twins take a long time to separate within the womb, and sometimes they don't separate entirely (conjoined twins). If doctors observe the two fetuses are connected at any point, that means identical twins.

You can also do a DNA test on the amniotic fluid surrounding the fetuses. If there are two sets of DNA present, it means fraternal twins. If there is only one unique set of DNA, it means identical twins.

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13y ago
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Q: How do doctors to recognize identical or fraternal twins during pregnancy?
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