Physiological jaundice is a common condition in newborns growing up, caused by high bilirubin in the body. How long it takes for physiological jaundice to subside needs to be analyzed on a child-by-child basis. In the case of a full-term baby, the remission time is faster, while in the case of a premature baby, the remission time is a little slower. Usually, in the case of a full-term baby, physiological jaundice usually appears 2-3 days after birth, peaks at 4-5 days, and then subsides in 5-7 days, with a maximum of 14 days; however, in the case of a premature baby, it appears a little earlier or later than in a full-term baby, but mostly appears 3-5 days, peaks at about 10 days, and then subsides in about 21 days, with a maximum of 28 days. If the jaundice is diagnosed as physiological, parents usually do not need to take special care of the baby, they can strengthen the feeding, let it eat more, and bring the baby to the sun more often to help the jaundice dissipate, but the resistance of the newborn is relatively poor, so pay attention to the cold to keep warm, so as not to catch a cold in the sun. If neonatal jaundice appears within 24 hours after birth, it is necessary to consider the possibility of pathological jaundice, which has a variable time to dissipate. If diagnosed, blue light irradiation is required under the guidance of a medical professional to promote the excretion of unconjugated bilirubin for the purpose of eliminating jaundice, and medication can also be used. However, if both methods are ineffective, blood exchange therapy may be chosen.