A child born to an ab blood type father and an o blood type mother may have hemolysis. A child born to a father with blood type ab and a mother with blood type o has blood type a or b. The blood type a or b inherited from the father’s side stimulates the mother to produce antibodies, which enter the fetus and combine with the sensitized red blood cells of the fetus, which may cause hemolysis of the fetus, resulting in jaundice, anemia and other symptoms of the fetus. When hemolysis occurs in newborns, light therapy can be used to reduce the level of unconjugated bilirubin in the fetal serum. Plasma or albumin can also be transfused to increase the binding of unconjugated bilirubin and reduce the incidence of neonatal bilirubin encephalopathy. If necessary, hemolytic symptoms can be reduced by blood exchange therapy to remove sensitized red blood cells or free antibodies from the blood. When hemolysis occurs in a newborn, it is important to seek medical attention and appropriate treatment should be given under the supervision of a physician.