Whether a newborn with three-day jaundice of 14.3 mg/dL needs blue light depends on the cause of the jaundice and the size of the gestational week. If it is a full-term baby with no risk factors above 38 weeks, blue light phototherapy is not needed in principle. However, in the case of hemolytic jaundice and other babies with risk factors at a gestational age of >38 weeks, or premature babies at a gestational age of less than 37 weeks, blue light phototherapy is needed. 1. Full-term babies: if the gestational week is 38 weeks or more without any high-risk factors, the newborn indicators are stable, in principle, do not need blue light phototherapy, can closely monitor the bilirubin level, if necessary, blue light phototherapy. However, because the neonatal blood-brain barrier function is not yet fully developed, it is easy to occur bilirubin encephalopathy, and some babies can not be immediately assessed whether there are high-risk factors, if necessary, according to the actual situation can be appropriately relax the indications for blue light phototherapy. If the gestational week > 38 weeks with high-risk factors of the baby, three days of jaundice 14.3mg/dL, is the need for blue light phototherapy. 2. Premature babies: premature babies born at less than 37 weeks of gestation, if the jaundice value is 14.3mg/l, blue light treatment should be carried out in time. If the baby has high bilirubin level, it is recommended to go to the neonatology department of the hospital in time, follow the doctor’s instruction to carry out targeted treatment to avoid delaying the condition, resulting in irreversible brain damage, the specific treatment should follow the doctor’s instructions, according to the baby’s own situation in the professional neonatologist under the guidance of the choice of whether to carry out blue light phototherapy.