The maximum number of days a newborn can be exposed to blue light for jaundice depends on the severity of the child’s own jaundice. If the newborn belongs to the normal physiological jaundice, generally do not need blue light treatment, after a period of time jaundice will subside by itself. If the newborn belongs to pathological jaundice, the condition of mild cases should be irradiated with blue light for 3~5 days, and severe cases need about 7 days, this time value is not fixed, according to the severity of the child’s own jaundice to decide. Generally, the jaundice value should be measured before and after irradiation of blue light, if the jaundice returns to normal, the blue light treatment can be suspended, at least 24 hours jaundice value does not rebound, you can consider stopping the blue light treatment. The treatment of neonatal pathologic jaundice mainly depends on the treatment of the primary disease, blue light irradiation is only an auxiliary relief, if not actively treat the primary disease, jaundice may recur. If jaundice occurs in newborns, it is recommended to go to the hospital in time.