Jaundice is the most common condition seen in newborns. It occurs when high levels of bilirubin are exhibited in the blood. This causes yellowing of the skin. In extreme cases fatigue and poor feeding are seen. In mild cases treatment might not be necessary. The condition is simply monitored. If bilirubin levels are very high, phototherapy may be required to break down the bilirubin (as pictured). Rare complications include deafness, cerebral palsy and kernicterus (brain damage). Learn more at NIH.