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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.
Cleft lip and/or palate is one of the most common problems found in newborn babies. Each year in the US, over 5,000 babies are born with clefts.