ABO: You are a+, the woman is o+. Women who are o+ carry anti-a and anti-b antibodies. The child will either be a+ or o+. If the child is a+, there is a chance that mother's anti-a antibodies will be high and cross the placenta and cause red cell break down. This doesn't affect the baby in utero but may cause high bilirubin levels (or jaundice) in the new born.
Answered 8/11/2012
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