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Hemolytic disease of the newborn (HDN) is a disease in which there is hemolysis in a newborn or fetus caused by blood-group incompatibility between mother and child. There are a bunch of related terms: Immune hydrops (Hydrops means accumulation of edema fluid in the fetus during intrauterine growth.
The amnion is a thin, tough membrane that protects a developing child. It allows for nutrients to reach the fetus and wastes to be removed. Amniotic fluid is found inside of the amnion, and will provide protection for the developing child until it is time for the pregnancy to end.