But it will affect any further pregnancies that the mother can actually have, especially if that next child is also RH positive. So once again, during the first pregnancy some of the red blood cells of the fetus that have antigen DRH factor can leak into the mother's blood. Now this leakage of red blood cells that contain antigen D into the mother's bloodstream that is who is RH negative, will cause the immune system of the mother to begin producing antigen D antibodies. However, since the fetal red blood cells usually leak during childbirth, this will not affect that fetus. But let's suppose the same woman who has been exposed to these antigen D proteins and now contains those antibodies against antigen D. Let's suppose she once again becomes pregnant with a fetus who is once again RH positive. What will happen now?