If both parents have blood type B, the baby’s blood type will only be the same as that of the parents, and hemolysis will not occur. ABO hemolysis usually occurs when the mother has blood type O and the father has blood type A or B. ABO hemolysis occurs when the blood type of the fetus does not match that of the mother. The incompatibility of the mother’s and child’s blood types may lead to hemolytic jaundice in the newborn. It should be noted that even if both parents have B blood type, the baby can not completely exclude the possibility of pathological jaundice. This is because there are various causes of pathological jaundice, including inborn genetic metabolic diseases and biliary atresia. In order to ensure the health of the baby, after the birth of the fetus need to do a good job of clinical observation, the emergence of elevated bilirubin the first time to contact the doctor, under the guidance of professional doctors for symptomatic treatment.