Breast milk
There are two types of newborn jaundice. Breast milk jaundice occurs in about 1 in 200 babies. Here the jaundice isn't usually visible until the baby is a week old. It often reaches its peak during the second or third week. Breast milk jaundice can be caused by substances in mother's milk that decrease the infant's liver's ability to deal with bilirubin. Breast milk jaundice rarely causes any problems, whether it is treated or not. It is usually not a reason to stop nursing.