How your blood group type can affect your pregnancy

The ABO typing is a diverse blood grouping system that consist of blood types A, B, and O. The blood type A has A-antigen on the red cells, B blood type has B-antigen and blood type O has no antigen A or B on the red cells. In blood type O has antibodies to A and B in plasma there are none in blood types A and B. Incompatibility mostly affects babies with A or B blood type and mother with O blood type.

Premature babies are more likely to suffer a worse reaction than the full term babies, who have a mild version of it. Unlike rhesus incompatibility the ABO incompatibility can affect firstborns. However, B- means that the blood group does not have a rhesus factor.