https://www.webmd.com/baby/features/pregnancy-and-rh-disease Rh negative mother's immune system sees the proteins on an Rh positive fetuses blood and treats them as an infection. This is an incredibly easy thing to research because racist jews haven't seen the implications yet and censored anything. Except you, and what you're trying to do here. Stop trying to ride us like beasts of burden. I denied your people long ago. Go take care of yourselves, if you are even capable of it.