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Bland-White-Garland syndrome is a rare syndrome with anomalous origin of the left coronary artery (LCA) arising from the pulmonary artery, resulting in left ventricular failure. It could occur shortly after birth. We here reported the case of a 6-week-old boy with aortostenosis. Coronary angiography revealed an anomalous LCA arising from the pulmonary artery. Representation of a prominent right coronary artery (RCA) delivered numerous collateral vessels to the LCA area. The patient underwent a correction operation with translocation of the LCA and re-implantation into the ascending aorta. One month after operation, clear decrease in the expanded ventricle was noted with an increase in the contractibility.