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405134 t1_j6ki9p9 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

Human twins in the womb don’t share blood supply between themselves, the blood comes from the mother , and her blood enters each twin through the umbilical cord separately

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sionnach t1_j6mnp3g wrote

If only that were always true. Twin to Twin Transfusion Syndrome and Twin Anamea Polychthaemia Sequence are pretty horrible things that happen not infrequently in monochorionic (identical) twins.

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405134 t1_j6oufl5 wrote

Wow , that’s gotta be pretty rare though right? And I’m sure situations where twins are conjoined in the womb also potentially could share blood; like conjoined twins

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