The amount of jaundice in an infant that requires blue light cannot be determined accurately, but depends on the severity of the jaundice and the type of disease. Infants with jaundice may have physiological jaundice or pathological jaundice. If physiological jaundice occurs, generally there is no need for blue light irradiation, and it will gradually return to normal in about 7~15 days. Normally need to drink more water, appropriate sunshine, also can use Yin gardenia yellow and other medicines under doctor’s instruction to treat. If appears is the pathologic jaundice, easily affects the infant’s growth and development, needs the doctor according to the jaundice severity and the pathologic jaundice type to choose whether to carry on the blue light irradiation, in order to avoid the complication. After the appearance of jaundice, we must closely observe the growth and development of the infant and actively seek medical treatment.