We present 2 cases seen at our institution between January - February, 2005 in infants ages 1 and 5 months, both with cardiac signs as initial presentation. The younger infant had cardiomegaly since birth and was hospitalized briefly for respiratory distress at 1 month. The older infant, diagnosed at 4 months with hypertrophic cardiomyopathy, was hospitalized after cardiac arrest one month later. Both children had various tests done during the course of diagnosis and treatment, including GAA enzyme assay, cardiac catheterization, endomyocardial biopsy, developmental assessment, genetic evaluation, EKG, CXR and echocardiography.