A 4-day jaundice value of 17mg/dl in a premature baby is usually severe. The normal value of jaundice in preterm infants is bilirubin less than 15mg/dl (milligrams per 100 milliliters). If on the 4th day of preterm delivery, the jaundice index reaches 17mg/dL, the mental status is poor, the milk intake is severely reduced, and there is a combination of infection, hypoxia, hemolysis and other high-risk factors, the baby’s jaundice is very serious. Must go to the hospital neonatology hospitalization and treatment, generally take blue light irradiation treatment, blue light irradiation treatment can effectively treat the child’s jaundice, jaundice value must be reduced to within the normal range, because the jaundice value is too high, it will be easy to cause the child’s bilirubin encephalopathy, affecting the newborn’s growth and development and intelligence and other issues. Premature babies with jaundice value of 17mg/dl must go to the hospital and receive standardized treatment under the guidance of the doctor.