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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.
1 Congenital heart defects are the most common birth defects. Nearly one of every 100 babies is born with a CHD.  Each year approximately 40,000 babies are born in the United States with a congenital heart defect. (Source: CHPHC)