<unk>  is one of the causes of hemolytic<unk>  of the newborn (also known as HDN).  The<unk>  ranges from mild to severe.  When the<unk>  is mild the fetus may have mild anaemia with reticulocytosis. When the<unk>  is moderate or severe the fetus can have a more marked anaemia and erythroblastosis (erythroblastosis fetalis).  When the<unk>  is very severe it can cause morbus haemolyticus neonatorum, hydrops fetalis, or stillbirth.
Rh disease
Rh deficiency syndrome
Rh incompatibility
Fanconi anemia
Hughes-Stovin syndrome
ABO incompatibility
Alagille syndrome
Diamond-Blackfan anemia