If a woman with Rh-negative blood bears a baby fathered by an Rh-positive man, there is a grave risk that she will become sensitized to the Rh factor in her baby's blood and begin to produce anti-Rh antibody. The process is not likely to affect the first baby, but in subsequent pregnancies the mother may make so much of the antibody that her own blood will destroy most of her child's red blood cells and threaten its life. When that happens, massive transfusions, often involving complete replacement of the baby's blood immediately after birth, are the only cure.
On the theory...
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