Yellow skin in children may be caused by genetic factors, neonatal jaundice, dietary factors, liver and gallbladder diseases, malnutrition and other reasons. 1. Genetic factors: yellow skin in children has a certain relationship with heredity, if one or both parents have yellow skin, it may be passed on to children. 2. Neonatal jaundice: most newborns may develop jaundice after 2~3 days of birth, which is mainly manifested as yellowing of the skin. If the value of jaundice is normal, it is physiological jaundice, but if the value of jaundice is abnormal, it may be pathological jaundice. 3. Dietary factors: Due to excessive intake of carotenoid-rich foods, such as carrots, pumpkin, orange juice, mango, etc., which accumulate in the blood, carotenemia may occur, which is usually manifested by yellowing of the skin. 4. Liver and gallbladder diseases: If a child suffers from liver and gallbladder diseases, such as hepatitis, bile duct atresia, etc., it can also cause yellowing of the skin. 5. Malnutrition: children’s partiality and picky eating, insufficient nutritional intake or lack of micronutrients can lead to yellowing of the child’s skin, anemia, diarrhea and other conditions. When children have yellow skin, they should go to the hospital in a timely manner, to clarify the cause of the disease, and then follow the doctor’s instructions to carry out the appropriate treatment.