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neobeguine t1_jdma7my wrote

Reply to comment by MrCW64 in TIL, the placenta that forms with a fetus isn't created by the mother. It grows from the fertilized egg and some fetuses actually develop outside the uterus attached to the intestines in the body cavity. by darw1nf1sh

The placenta and fetus have HALF the mothers DNA and half the fathers. The father's half is foreign DNA to the mother. This is relevant, for example when the mother and fetus's blood type are incompatible which can lead to the mothers immune system attacking the fetus

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level27jennybro t1_jdmrgv9 wrote

And you end up with a rhogam shot injected directly in your ass cheek.

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Darlmary t1_jdmw0n8 wrote

Yep. I'm A- and my husband is A+. Thankfully, rhogam exists! Both my daughters are A+, so they won't need it if they choose to conceive.

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trimolius t1_jdmywle wrote

Something I learned when it happened to me is that they make rhogam for when this happens with Anti-D antibodies but there are other antibodies your baby could have like Anti-E and Anti-K (Kell) that they don’t make a shot for! It can be very dangerous.

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