Breastfeeding jaundice may occur in the first week of life in more than 1 in 10 breastfed infants. The cause is thought to be inadequate milk intake, leading to dehydration or low caloric intake. It is a type of physiologic or exaggerated physiologic jaundice.
Breast milk jaundice is far less common and 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 mom'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.