Neonatal jaundice generally has yellow skin, yellow eyes and yellow urine as external characteristics, which are relatively easy to determine. Adults can press on the baby’s skin to observe the color, or they can observe the color of the white eyes to determine jaundice, or they can go to the hospital and test the jaundice value with a special instrument. Jaundice in newborns may be physiological or pathological. If the jaundice is physiological, it will subside on its own within a month without special treatment. The distribution of physiological jaundice is mainly on the face and lower legs of the body. If blood is drawn to measure bilirubin, it does not exceed 12 mg/dL for full-term infants and 15 mg/dL for preterm infants at the peak of jaundice. Pathological jaundice is caused by a disease that causes abnormalities in the metabolism of bilirubin. It occurs at a specific time in the newborn, making physiological jaundice significantly worse and easily confused with physiological jaundice. It is best to go to the hospital to have the blood bilirubin tested. The value of jaundice can be roughly estimated according to the area where it appears. In general, if the jaundice is only on the face, the degree is not serious; if the jaundice has progressed from the head and face to the chest and abdomen, the jaundice is moderate; if the jaundice has progressed to the hands and feet, especially the palms and feet, it means that the jaundice is more serious and must be checked and seen in the hospital.