The normal value of jaundice in newborn babies is no more than 12.9 mg/dl if they are delivered at full term, and no more than 15 mg/dl in premature babies in general. Jaundice is one of the most common symptoms of the neonatal period, mainly caused by excessive bilirubin that accumulates in the body. Jaundice in this period includes both physiological and pathological. Physiological jaundice occurs in most full-term and preterm babies. Physiological jaundice is mainly due to abnormal bilirubin metabolism in newborns, which leads to an increase in bilirubin concentration, while the liver function has insufficient bilirubin uptake capacity and reduced bilirubin excretion capacity, causing the child to develop a yellowish tinge. Physiological jaundice generally does not require treatment and will slowly subside on its own. Premature babies are a little later to recede, usually within 3-4 weeks. The causes of pathological jaundice are mainly related to excessive bilirubin production, impaired liver bilirubin metabolism, impaired bile excretion and other factors, such as neonatal hemolytic disease, various infectious diseases, hepatitis cholestasis and other hepatobiliary diseases can lead to pathological jaundice in newborns. In general, pathological jaundice generally requires prompt identification of the cause and treatment of the cause and reduction of yellowing. If the jaundice value is within the normal range, physiological jaundice is generally considered more likely; if the jaundice value is high and exceeds the range of physiological jaundice, pathological jaundice is considered and requires prompt hospitalization for further treatment.