The criteria for blue light irradiation for full-term neonatal jaundice are mainly combined with the age of the newborn and the value of jaundice. Within 24 hours after birth, newborns with jaundice greater than 9 mg/dl measured percutaneously are recommended for phototherapy; within 1-2 days, newborns with jaundice greater than 12 mg/dl measured percutaneously require blue light exposure; 2-3 days after birth, jaundice greater than 15 mg/dl measured percutaneously is recommended for phototherapy; for newborns older than 3 days, jaundice greater than 17 mg/dl measured percutaneously on average, this In such cases, blue light intervention was performed. The criteria for phototherapy in preterm infants are based on gestational age and weight, and the younger the gestational age and the lower the weight, the stricter the criteria for phototherapy. In case of unsuccessful or failed phototherapy, blood exchange therapy is required.