A disorder of the fetus or newborn that occurs when fetal cells that are coated with IgG alloantibodies from the mother attack antigens inherited from the father. Severity can range from absence of symptoms to death. The disease is Monarch Disease Ontology term MONDO_0006760 (fetal erythroblastosis). Also known as: EF - erythroblastosis foetalis, HDFN, erythroblastosis fetalis, haemolytic disease due to rhesus isoimmunisation, hemolytic disease of the fetus or newborn, hemolytic disease of the foetus or newborn, hemolytic disease of the newborn, isoimmune hemolytic disease of the newborn.