The occurrence of jaundice in newborns may be physiological or pathological, and although both manifest as jaundice, there is a difference between the two, which can be identified by the following characteristics Physiological jaundice in newborns is generally not deep and has these characteristics: 1. Jaundice usually begins to appear 2-3 days after birth. 2, jaundice gradually deepened, reaching a peak on the 4th-6th day, and then gradually reduced. 3, full-term birth of newborns, jaundice generally subsides in 2 weeks after birth, preterm infants generally subsided in 3 weeks after birth. 4, the degree of jaundice is generally not deep, the skin color is light yellow, jaundice is often limited to the face and upper body, jaundice when the child’s general condition is good, normal body temperature, normal appetite, normal color of urine and stool, normal growth and development. If the child’s jaundice is more than 2mg/dl, but less than 12mg/d1, parents should not worry. Pathological jaundice is caused by a disease that causes abnormalities in the metabolism of bilirubin, which occurs at a specific time in the newborn, making physiological jaundice significantly worse and confusing it with physiological jaundice, making the diagnosis of jaundice difficult. However, pathological jaundice has some features that are different from physiological jaundice: 1. Jaundice appears too early, within 24 hours after birth. 2, jaundice subsides too late, lasts too long, exceeds the normal time of remission, or jaundice has subsided and reappears, or jaundice gradually recedes after the peak time and progressively worsens. 3.The degree of jaundice is too severe, often spreading throughout the body, and the skin mucous membrane is obviously yellow. 4.The bilirubin exceeds 12mg/dl when the serum bilirubin is checked, or rises too rapidly, more than 5mg/dl per day. 5.It is accompanied by other abnormalities in addition to jaundice. Therefore, when a child develops jaundice, if any of the above 5 aspects are present, it should be of great importance to parents so that pathological jaundice can be detected early for timely treatment.