Physiologic jaundice, in full-term infants, usually subsides within 7-10 days, while in preterm infants it usually subsides within 2-4 weeks. Physiologic jaundice is due to abnormal bilirubin metabolism in newborns, most of which appears in the first 2-3 days after birth and reaches its peak in 4-5 days. Full-term infants usually subside within 7-10 days, while preterm infants usually subside within 2-4 weeks. Children with jaundice are mainly characterized by mild yellowing of the skin and sclera of the cheeks, and there are usually no other abnormal clinical signs and symptoms, so no special treatment is usually required. If the jaundice appears earlier and the yellowing of the skin is severe, the yellowing is delayed or recurs, and the child has poor appetite and poor mental status, then it can be considered as pathological jaundice. At this time, you need to go to the pediatric department of the hospital in time, and take blue light irradiation treatment or drug treatment. In conclusion, during the period of newborn jaundice, it is necessary to ensure balanced nutrition, reasonable feeding, timely supplementation of vitamins and trace elements, drink more water, more sunshine.