Jaundice is frequently seen in newborns around 3rd or 4th day of life. It is physiological. But for a mother of negative Rh blood group with a Rh positive child, the jaundice could be due to Rh incompatibility. At the mentioned levels, treatment with single or double surface phototherapy should be enough. Phototherapy consists of a simple exposure to light of a certain wavelength and it helps in solubilisation of the bilirubin (which is responsible for causing jaundice) and thus it gets eliminated through urine. If the level rises even further, exchange transfusion with O negative blood might be needed. But most often, it resolves with phototherapy alone.