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... the placenta does allow maternal IgG antibodies to pass to the fetus to protect it against infections. However, these antibodies do not target fetal cells, unless any fetal material has escaped across the placenta where it can come in contact with maternal B cells and make those B cells start to produce antibodies against fetal targets. The mother does produce antibodies against foreign ABO blood types, where the fetal blood cells are possible targets, but these preformed antibodies are usually of the IgM type, and therefore usually do not cross the placenta.
Apparently because the mother's immune system has not been exposed to the fetal cells ...
Regarding the mother's immune system contact with non-mother cells, what about it attacking the placenta itself? Certainly it comes into contact with the placenta, right?