Baby and Parent Blood Types

Use the chart below to determine the possible ABO blood groups for couples and their children.

If the couple’s blood types are: The child’s blood group could be:
Possible Impossible
O and O O A, B, or AB
O and A O or A B or AB
O and B O or B A or AB
O and AB A or B O or AB
A and A O or A B or AB
A and B O, A, B or AB None
A and AB A, B or AB O
B and B O or B A or AB
B and AB A, B or AB O
AB and AB A, B or AB O