Neonatal jaundice is a condition characterized by yellowing of the skin, mucous membranes and sclera during the neonatal period due to abnormal bilirubin metabolism, which causes an increase in the level of bilirubin in the blood, and it is the most common clinical problem among infants. Neonatal jaundice is divided into physiologic jaundice and pathologic jaundice. Physiological jaundice refers to temporary jaundice caused solely by the characteristics of bilirubin metabolism, which usually appears 2 to 3 days after birth, reaches the peak in 4 to 6 days, and subsides in 7 to 10 days without clinical symptoms. It is caused by late maternal milk, newborns do not eat enough, without special treatment, physiological jaundice to recede quickly, you can give the child more milk, frequent sucking, so that newborns urinate more, defecate more, seasonal temperature permitting, you can give the baby bare body sunshine, but also help jaundice subside. If jaundice appears 24 hours after birth, daily serum bilirubin rises more than 5mg or >0.5mg per hour, lasts for a long time, full-term babies more than 2 weeks, preterm babies more than 4 weeks do not subside, or even deepen and aggravate the occurrence or recurrence after subsiding, or jaundice only begins to appear one week to several weeks after birth, then it is pathologic jaundice. Then you need to go to the hospital, under the guidance of the doctor to take anti-yellowing drugs, if you reach the standard of phototherapy, you can take a blue light, the doctor will determine the time of blue light treatment according to the degree of jaundice, and generally will achieve a more satisfactory effect.