The physiologic jaundice of normal full-term infants has subsided slowly or completely at about 10 days, and the value usually does not exceed 10mg/dL. The physiologic jaundice of preterm infants has a longer time to subside, and the value does not exceed 15mg/dL at about 10 days, and the specific situation also depends on the weight of preterm infants, the age of the fetus, and the condition of the infants, etc. If the value is still higher than 15mg/dL at about 10 days, it is pathologic. If the jaundice value is still higher than 15mg/dL after 10 days, it is pathologic jaundice. Pathological jaundice requires timely intervention and treatment, depending on the level of jaundice, different treatment programs are adopted, and the commonly used treatments are blue light irradiation to reduce jaundice and intravenous application of albumin to reduce free bilirubin. If there is hemolytic jaundice, intravenous gammaglobulin is needed to block hemolysis.