How long it takes for neonatal jaundice to subside is mainly related to the specific etiology and the individual condition of the child, and should be analyzed clinically on a case-by-case basis, not as a generalization. In the case of physiologic jaundice in newborns, it usually subsides in full-term infants about 5-7 days after birth, and no later than 2 weeks. In the case of preterm infants, physiological jaundice subsides about 7-10 days after birth, and no later than 3-4 weeks. In the case of pathological jaundice in newborns, due to more causes, such as hemolysis and sepsis, the jaundice will only subside after the cause is removed, and the exact time is not clear as it is related to the treatment. Physiological jaundice in newborns usually does not require treatment, but in children with pathological jaundice, treatment of the jaundice itself, such as blue light irradiation therapy, is required in addition to treatment of the primary cause.