Serious congenital heart defects usually are noticed soon after birth or during the first few months of life. Signs and symptoms could include: 
Pale gray or blue lips, tongue or fingernails (cyanosis)
Rapid breathing
Swelling in the legs, belly or areas around the eyes
Shortness of breath during feedings, leading to poor weight gain
 Less-serious congenital heart defects may not be diagnosed until later in childhood. Signs and symptoms of congenital heart defects in older children may include: 
Easily becoming short of breath during exercise or activity
Easily tiring during exercise or activity
Fainting during exercise or activity
Swelling in the hands, ankles or feet
