Problem:
As far as I know the fetus is fed by the umbilical cord which basically connects his/her circulatory system with the mother's in order to supply oxygen and nutrients. But how is this possible if they (the mother and the fetus) have different incompatible blood types?
It is possible that the father has A blood type, the mother B and the child A and thus incompatible with the mother's.
Justify and explain in detail.