Some newborn babies may develop jaundice after birth, which is caused by some abnormalities in their metabolism, so there are many reasons for this situation, which can be treated according to their own situation. 1, when the body of some red blood cells, there is an increase in the disease, then they will be on the gastrointestinal circulation, causing serious impact, so that those free bilirubin, rapid progressive rise, and trigger the emergence of this jaundice phenomenon. 2, some babies will appear jaundice phenomenon, because his mother, during pregnancy intake of some excessive drugs, such as sulfonamides, or various painkillers, some because the mother’s blood type and the baby is different, and triggered by the condition. 3, when the baby’s liver cells excretion, by other obstacles, is likely to lead to some other diseases, such as neonatal hepatitis, or congenital diseases, and there are some jaundice phenomenon is also a normal physiological reaction, after a few days will gradually subside. There are many causes of jaundice, some of which are caused by physical diseases, others are normal physiological phenomena, and some mothers’ milk affects the metabolism of bilirubin, which can also cause jaundice.