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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.
Plastic Surgery. Cleft lip and palate are two of the most common birth defects worldwide today. They affect approximately 1 in 800 babies born today in the United States, though the incidence climbs to 1 in 500 to 600 worldwide.