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Modern humans still have the exact same troubles with Rh incompatibility, we only learned how to overcome them very recently.

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Rh disease seems to me to be far from being the exact same issue as what was suggested in this thread. Rh disease is due to bloodtype incompatibility between the mother and the baby, and only sometimes triggers.

Even then, Rh disease usually only causes symptoms in the baby in subsequent pregnancies with the same bloodtype incompatibilities, when the antibodies already exist in the mother.

I'm not sure what exactly it means that Neanderthal women's uterus wouldn't be able to host HS babies, but that sounds different to me.

Unless you know more about this Neanderthal uterine incompatibility.

The thing with Neanderthals is that there is much more crossbreeding observed in genetic lines between Neanderthal males and AMH females than Neanderthal females and AMH males, not that only the former is observed. Rh incompatibility is often proposed as a possible explanation, so I believe that's what was being (inaccurately) referred to here as "not being able to host the offspring".

I see, that makes a lot of sense. Thanks!

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