Baby's Blood Type: Possible Combinations When Mom is O and Dad is AB

Yes, it is possible for your baby to be born with type B blood if his father is type AB and you are type O.

Blood type is determined by the presence or absence of two antigens, A and B, on the surface of red blood cells. A person with type B blood has the B antigen but not the A antigen, while a person with type AB blood has both the A and B antigens. A person with type O blood has neither the A nor the B antigen.

When a mother and father with different blood types have a child, the child's blood type is determined by the combination of antigens they inherit from each parent. In your case, your baby could inherit the B antigen from his father and the O antigen from you, which would result in type B blood.

Here is a breakdown of the possible blood type combinations for a child with a father who is type AB and a mother who is type O:

Father: AB

* Mother: O

* Children: A, B, AB, O