Neonatal jaundice is divided into physiological jaundice and pathological jaundice, regardless of which jaundice has the common symptom of yellowing of the skin, but other symptoms may vary. The symptoms of physiological jaundice are mainly in the first few days of life, the skin of the newborn will appear yellow, mostly on the head, face and trunk area, other parts may be normal skin color, the severity of the yellowing has some individual differences, but in about 7-10 days will subside on its own, blood serum bilirubin test results are also within the normal range. Pathological jaundice usually occurs within a day after birth and may persist, with symptoms increasing throughout the baby’s body, with the soles of the feet and the palms of the hands being the most obvious locations. If left untreated, the baby may moan or have convulsions, and in severe cases, death may result. The results of a blood test for serum bilirubin can also be very high. Therefore, in the case of neonatal jaundice, if the skin yellowing is particularly severe and has not completely subsided after a week, you need to go to the hospital for a serum bilirubin test. If the test result is high, the jaundice is pathological and needs to be treated promptly, which can be done by blue light irradiation and blood exchange.