Neonatal jaundice (hyperbilirubinemia) is a higher-than-normal level of bilirubin in the blood. Bilirubin, a by-product of the breakdown of hemoglobin (the oxygen-carrying substance in red blood cells), is produced when the body breaks down old red blood cells. Normally, the liver processes the bilirubin and excretes it in the stool. An excess of bilirubin in the blood leads to a yellow discoloration of the skin and the whites of the eyes called jaundice. This condition is particularly common in newborn infants. Before birth, an infant gets rid of bilirubin through the mother's blood and liver systems. After birth, the baby's liver has to take over processing bilirubin on its own. Almost all newborns have higher than normal levels of bilirubin. In most cases, the baby's systems continue to develop and can soon process bilirubin. This development can be encouraged by beginning breastfeeding or formula feeding as...