ohdearitsrichardiii t1_j1rw3wu wrote
Reply to comment by Jimboats in What happens if a mother‘a child has a non-compatible blood type? What will happen when she is pregnant? by thebookklepto
They don't care about the (potential) father's blood type, they can tell the fetus's blood type from the mother's blood sample. I'm Rh-, they could see when I was about 10 weeks pregnant that my kids were Rh+ so I got the serum
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