If the father is B positive and the mother is A negative, can the child be A positive?

Answer

Best,

If the parents have B+ and A-, the child can perfectly have A-.

When a woman with Rhesus factor- is pregnant with a child with Rhesufactor +, there may indeed be danger. When a Rhesus woman is pregnant with her first child with Rhesus+, there is a good chance that the baby’s blood will leak into the mother’s blood during delivery. This causes rhesus+ antigens to pass from the baby’s blood into the mother’s blood. As a result, the mother will form antibodies against Rhesus+. There is no problem for the baby; by the time the antibodies have been formed, it is usually already born.
However, when this woman becomes pregnant again with a rhesus baby, there is no problem. However, if she becomes pregnant with a rhesus+ baby, the rhesus+ antibodies present in the mother’s blood will enter the blood of the foetus. After all, antibodies pass effortlessly through the placenta. As a result, the baby’s blood begins to coagulate and thus actually clot. In that case it is best for the baby that he is born as soon as possible and therefore prematurely, before his blood is completely broken down.

This problem can be avoided by injecting Rhesus women with a small dose of antibodies against Rhesus+ antigens immediately after the first delivery. If blood from the baby has leaked into the mother’s blood, the antibodies will neutralize the rhesus+ antigens before the mother has a chance to form them herself. This treatment is almost routine nowadays.

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