Neonatal jaundice includes physiologic jaundice, breast milk jaundice and pathologic jaundice, which is usually caused by excessive bilirubin production, impaired liver function and bile duct obstruction. 1. Physiological jaundice: It is often caused by the metabolic characteristics of the newborn, such as excessive production of bilirubin, weak ability of liver cells to process bilirubin, or insufficient ability of plasma albumin to bind bilirubin, etc. However, it usually does not have any effect on health. 2. Breastfeeding jaundice: Most common in exclusively or predominantly breastfed newborns. The exact cause is still unclear, but it is thought to be related to enzymes or genes in breastmilk. 3. Pathological jaundice: it may be caused by excessive production of bilirubin, bile excretion disorder or hepatic bilirubin metabolism disorder, etc. It is mostly seen in hemolytic or hepatobiliary diseases. If it is pathological jaundice, you must go to the hospital in time and cooperate with the doctor to take examination and treatment.