If the jaundice has not gone down after 40 days, it is mainly due to the following reasons. Firstly, it is caused by children suffering from breast milk jaundice, when children suffer from breast milk jaundice, children eating mother’s breast milk will often cause jaundice to persist and not subside. At this time, the level of jaundice is not very high, rarely more than 15mg/dL, as long as the mental state is good, and the breastfeeding is normal, you can continue to breastfeed the baby, no special treatment is needed. Secondly, if the jaundice is caused by viral hepatitis, we need to give the child antiviral treatment in time, if it is caused by cytomegalovirus infection, we need to give the child ganciclovir.