Neonatal jaundice, if it is physiologic, will subside in about 1 week on its own, but if it is pathologic, the time for it to subside will depend on the severity of the disease and the treatment. Jaundice is caused by the elevation of bilirubin. In neonatal jaundice, it can be divided into physiological jaundice and pathological jaundice. 1. Physiological jaundice: basically all babies in China will have different degrees of jaundice at birth, generally good, full-term babies mostly appear in 2~3 days after delivery, peak in 4~5 days, and subside in 5~7 days. In preterm babies, jaundice appears 3~5 days after delivery, peaks in 5~7 days and subsides in 7~9 days. 2. Pathologic jaundice: Jaundice usually appears within 24 hours after birth, and the duration of jaundice is long, more than 2 weeks for newborns and more than 4 weeks for preterm infants. The time to disappear is related to the cause of jaundice and the severity of treatment, and it will not disappear by itself. It is recommended that newborns with jaundice undergo relevant tests in the hospital to clarify the cause of the disease and then carry out effective treatment.