A 6-week-old patient weighing 4 kg was admitted for surgical correction of anomalous left coronary artery from the pulmonary artery. Reimplantation of the coronary artery with cardiopulmonary bypass was impossible because the patient also had hereditary spherocytosis, which put him at risk for hemolytic anemia. Thus, closure of the left main stem and left internal mammary artery-left anterior descending coronary artery bypass grafting were performed successfully with the heart beating.