If the child’s mother is of blood type O and the child develops hemolytic jaundice after birth, whether the condition is serious or not depends on the specific circumstances. First, if the hemolysis is mild, the jaundice index is low and does not exceed 10 mg/dL, and the child is in good spirits, eating milk, and having good bowel movements, the condition is not serious. If the jaundice index exceeds 15 mg/dL and rises progressively, the child’s mental state is not good, the child is not feeding well, and the child is screaming and drowsy, this is often a serious case and is often a sign of bilirubin encephalopathy.