<prompt> Commonest cause of heart failure in infancy isMyocarditisRheumatic feverCardiomyopathyCongenital heart disease  <response>: Congestive heart failure Congestive heart failure is state in which the heart cannot produce the cardiac out required to sustain the metabolic needs of the body, without evoking certain compensatory mechanism.The most common cause of CHF in infants Congenital heart disease.The most common cause of CHF in the older children Rheumatic fever rheumatic heart disease. 