Which two blood types are not suitable for marriage?

Patient's question:

My husband is AB blood type, and I am O. I saw online today that people with these two blood types have the worst compatibility when marrying, and their future children are prone to hemolytic disease. I am half convinced and half skeptical, so I want to consult for more details. Could you introduce it to me?
First follow-up question: How can this be avoided? We have had two miscarriages before, and before the next pregnancy, what preparations must be made to ensure that the child born will be healthy? Thank you.

Doctor's answer:

So many O types, but only a few hemolytic. Moreover, it can be avoided.

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