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The most common form of birth defects are congenital heart defects. This article describes the causes, symptoms, and treatments of congenital heart defects. Cleft Lip and Cleft Palate. The 4th most common birth defect is a cleft lip or palate.
Congenital heart defects (CHDs) are the most common type of birth defect. As medical care and treatment have advanced, babies with a CHD are living longer and healthier lives. Learn more facts about CHDs below. CHDs are present at birth and can affect the structure of a babyâs heart and the way it works.