Congenital heart defects are conditions present at birth that affect how a baby's heart is made and the way it works. They are the most common type of birth defects. In the United States, about 40,000 infants are born with a heart defect each year. The Pediatric Heart Center at Miller Children's Hospital Long Beach provides total prenatal, infant, pediatric and young adult heart care for patients with congenital or acquired heart disease or who have a family history of heart problems.