A 3-day-old infant presenting with jaundice, the baby's direct serum bilirubin is 0.2 mg/dl, with a total serum bilirubin of 11.8 mg/dl. Both the mother and baby have O-positive group, the infant's white cell count is 13.000/uL with normal differential count the hemoglobin is 15 g/dl, and the platelet count is 278.000/Ul. Reticulocyte count is 1.5%.