A woman who is o positive have a baby with an o negative man?

If a woman with O positive blood has a baby with a man who has O negative blood, the child will inherit one O allele from each parent, resulting in an O blood type. The Rh factor of the child could be either positive or negative, depending on the combination of the Rh factors inherited. Since the mother is Rh positive, she can pass on either a positive or negative Rh factor, while the father can only pass on a negative Rh factor. Therefore, the baby could be either O positive or O negative.