Icterus Neonatorum is a medical condition that causes yellowing of the skin and whites of the eyes in newborns. It is commonly known as neonatal jaundice. There are several synonyms for this condition, including hyperbilirubinemia, neonatal hyperbilirubinemia, jaundice of the newborn, and physiological jaundice. Neonatal jaundice occurs when there is an excess of bilirubin in the blood that cannot be processed by the liver. This condition is usually harmless and clears up on its own within a few weeks. However, severe cases may require medical treatment, including phototherapy or exchange transfusion. If you suspect your baby has neonatal jaundice, it is important to speak with your healthcare provider right away.