Physiologic jaundice regresses within 2 weeks after birth for full-term infants and 1 month for preterm infants. The duration of pathological jaundice is longer, and the specific time of regression needs to be analyzed in the context of the child’s physical condition and the cause of the jaundice. In neonatal units, purely physiological jaundice resolves relatively quickly, but the time to resolution varies between full-term and preterm infants. Generally, the jaundice is completely resolved within 2 weeks after birth in full-term infants, but in preterm infants, the resolution can be delayed until about 1 month. There is also a tendency to consider jaundice in preterm infants as pathological jaundice, which must be treated with aggressive intervention. In addition to jaundice in newborns, abnormal liver function, biliary obstruction, and even tumors, which are common in the digestive system, can also cause jaundice, and the time to resolution of jaundice depends on the condition. Therefore, it is recommended to actively treat the original cause of jaundice, pay attention to symptomatic treatment, and get more sunlight in general.