A five month old boy was admitted with symptoms of asthmatic bronchitis. Careful anamnesis revealed failure to thrive latest month, cough since age of three weeks and a few episodes of severe crying. He had cardiomegaly and an electrocardiogram showed Q waves and ST segment elevation in several leads. His condition suddenly deteriorated and he died of cardiac arrest. Autopsy revealed infarction and fibrosis of the myocardium and a left coronary artery originating from the pulmonary artery. Symptoms that earlier could have raised suspicion of cardiac disease are emphasized.