Most of the time, Rh incompatibility between mother (Rh-) and fetus (Rh+) doesn't cause fetal health problems with the woman's first pregnancy.

Question

Quizplus · Accepted Answer

Rh incompatibility between mother (Rh-) and fetus (Rh+) usually doesn't cause fetal health problems in the woman's first pregnancy because the mother's immune system doesn't have a chance to develop antibodies against the Rh factor until after the delivery. However, if the mother becomes pregnant with another Rh+ baby in the future, her immune system may attack the fetus's red blood cells, leading to health problems for the baby.

Most of the Time, Rh Incompatibility Between Mother (Rh-) and Fetus