The frequency of Rh negativity in the hospital based population was 6%. Cord blood estimations in normal infants showed a mean haemoglobin level of 17.3 G., bilirubin 2.2 mg.%, reticulocyte count 3.5% and normoblast count 3.5%. 110 infants with jaundice in the newborn period were investigated. 13% had serum bilirubin levels beyond the physiological limits. The causes of jaundice in order of frequency were isoimmunisation 22%, prematurity and low birth weight 11.8%, asphyxia 10.9%, maternal medication 10.3%, infection 5.5,%, Down’s syndrome 1.7%, cephalhaematoma 1.7%, vitamin K toxicity 0.9% and neonatal hepatitis 0.9%. In 38%, the aetiology was unknown.