The blood group is no problem, but you have to control the Rh factor
The Rh factor is the only one who can give serious problems of incompatibility blood between mother and fetus, exactly when the mother does not have (negative) and the fetus itself (positive), therefore, when a pregnant woman has a fetus negative group positive administering an inhibitor of the production of anti-Rh antibodies when approaching the time of delivery.
The differences in the other classification system type blood , the AB-0, does not have to cause problems between them.


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