This can be a cause if the baby had a low blood count from birth or very shortly after, especially if this is not the first pregnancy. Hemolytic disease of the newborn can be caused by the mother's antibodies attacking the baby's red blood cells if the baby if Rh positive and the mother is Rh negative. The antibodies get into the baby before birth, however, so if the baby developed a low blood count at 3 months it would not be because of the negative/positive blood type.
Yes, a father with A negative blood can have a child with A positive blood. If he does, the mother must have a positive Rh factor, and the mother's blood type may be any of the possibilities.
No.
yes.
B positive or negative or, O positive or negative.
Yes, a mother with negative and a father with O positive can have a baby with B positive. If they do, the mother must have blood type B or AB.
yes
95% not.
No. Rh negative is a recessive gene. Positive people do not carry it.
I'm not sure how negative or positive is determined, but a B mother and O father can have a B child.
yes
No
No, because a baby gets their blood from their father, not their mother.