CAN A+ and O+ have a baby?

That means each child of these parents has a 1 in 8 chance to have a baby with an O- blood type. An A+ parent and an O+ parent can definitely have an O- child.

What are the benefits of having O positive blood type?

Thirty-nine percent of the United States population has O-Positive blood, making it the most common blood type. Type O+ donors can help change the world by donating double red cells and by donating platelets (apheresis procedures).