Thousands of infants born each year have congenital cardiovascular defects.  Of those who have these defects,

• 4–10 percent have atrioventricular septal defect.
• 8–11 percent have coarctation of the aorta.
• 9–14 percent have tetralogy of Fallot.
• 10–11 percent have transposition of the great arteries.
• 14–16 percent have ventricular septal defects.
•  4–8  percent have hypoplastic left heart syndrome

• Arrhythmias. 
• Cardiomyopathies.
• Kawasaki disease.
• Rheumatic fever.
• Familial hypercholesterolemia will affect the future of an unknown but probably large number of children.
• Acquired immune deficiency syndrome (AIDS) with its myocarditis.

Related AHA publications:

• Your Child's Abnormal Heart Rhythm 
• If Your Child Has a Congenital Heart Defect 
• Your Heart and How It Works