Can an O negative and an OA negative blood type have a healthy baby?

Yes, an O negative (O-) parent and an A negative (A-) parent can have a healthy baby. The child's blood type can be A, O, or even AB, depending on the combination of alleles inherited from each parent. However, since both parents are Rh negative, there is no concern regarding Rh incompatibility. Overall, as long as there are no other health issues, they can have a healthy baby.