1. Four infants with congenital aortic stenosis of varying severity have been presented. 2. Clinical findings of severity include congestive heart failure, diminished pulse volume, and electrocardiographic evidence of left ventricular hypertrophy and strain. 3. Congestive heart failure which responds to digitalis therapy is not, in itself, a criterion for surgical intervention in infancy. 4. The presence of left ventricular hypertrophy and strain usually indicates the need for surgical intervention.