Possible ABO bloodtypes of children based on Maternal (across) and Paternal (down) ABO bloodtypes:

 

A

B

AB

O

A

A, O

A, B, AB, O

A, B, AB

A, O

B

A, B, AB, O

B, O

A, B, AB

B, O

AB

A, B, AB

A, B, AB

A, B, AB

A, B

O

A, O

B, O

A, B

O

 

Possible Rh bloodtypes of children based on Maternal (across) and Paternal (down) Rh bloodtypes:

 

Rh +

Rh -

Rh +

+ or -

+ or -

Rh -

+ or -

- only