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Very rarely, The AB father plus O mother scenario you describe can cause a disease: https://en.wikipedia.org/wiki/Hemolytic_disease_of_the_newborn_(ABO) More commonly, Rh-positive father plus Rh-negative mother can cause a disease: https://en.wikipedia.org/wiki/Rh_disease I can't find any reports of the mother suffering any ill effects from the baby's ...


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