The main reason why jaundice has not receded in four months is to consider whether there are blood, liver and biliary system diseases, you need to take your baby to the hospital to do the relevant examination in a timely manner. 1. Blood diseases: diseases that can cause hemolysis can lead to hemolytic jaundice, such as thalassemia and hereditary spherocytosis. 2. Liver diseases: all kinds of diseases that cause extensive damage to liver cells, such as viral hepatitis, toxic hepatitis, sepsis and so on. 3. Biliary tract diseases: such as intrahepatic obstructive cholestasis, biliary tract stenosis, etc. can cause jaundice. In summary, when the baby 4 months jaundice did not go away, there may be other reasons, you should take the baby to the hospital in time to do the relevant examination, consult the physician’s guidance, cooperate with the physician treatment.