A 22-year-old female asked:
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why rhd incompatibility of the mother and fetus doesn't affect the present fetus but subsequent pregnancies?

1 doctor answer
Dr. Richard Pollard
29 years experience Anesthesiology
See below: The incompatibility occurs when the mother is exposed to the blood of the new baby. This usually occurs at delivery. The mother then makes antibodies to that "foreign substance" and this can adversely affect the next pregnancy as the mother's immune system will see it as a "foreign" body and want to get rid of it. This problem is usually treatable with an injection at the birth of the first child.
Answered on Apr 24, 2015

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