Looked it up. Apparently in 0.1% of male/female twins they can be identical. But this means that the female ends up "losing" a chromosome and rather than becoming XX when the egg splits she is XO. They call this Turner Syndrome and it can lead to a range of medical issues including infertility, just like the cows mentioned above.
In 99.9% of cases involving male/female twins they are non-identical and do not share a placenta so the female is no more likely to be infertile than in singular female babies.
fermango t1_j6l2mz9 wrote
Reply to comment by Budget_Bathroom_1056 in TIL When a cow has opposite sex twins, the female twin is usually born intersex and infertile. This happens because the twins blood supplies are linked, which exposes the female to male sex hormones. by awawe
Looked it up. Apparently in 0.1% of male/female twins they can be identical. But this means that the female ends up "losing" a chromosome and rather than becoming XX when the egg splits she is XO. They call this Turner Syndrome and it can lead to a range of medical issues including infertility, just like the cows mentioned above.
In 99.9% of cases involving male/female twins they are non-identical and do not share a placenta so the female is no more likely to be infertile than in singular female babies.