The severity of neonatal jaundice15 depends on what day old the newborn is now. If the baby is within 7 days after birth, especially within the first 3 days after birth, the value is still relatively high, and the baby’s nervous system is not mature at this stage, the jaundice may continue to rise, possibly due to high bilirubin caused by the baby’s nervous system damage, you need to promptly take the baby to the doctor to give anti-yellowness treatment, and at the same time to find the cause of jaundice and treatment for the cause. If the baby is now more than 7 days old and the value is still around 15, although the jaundice value is not too low, it is relatively okay, you need to monitor the jaundice situation dynamically, it is best to measure the jaundice every day, if the progressive increase is also necessary to intervene, but also through detailed medical history, physical examination and the necessary auxiliary examination to help find the cause of jaundice. Common causes of high neonatal jaundice include: erythrocytosis, neonatal hemorrhage, infection, neonatal hemolytic disease, presence of asphyxia, hypoxia, etc., all of which can lead to pathological jaundice and require prompt identification and treatment of the cause.