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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.
Down syndrome is the most commonly occurring chromosomal condition. Approximately one in every 700 babies in the United States is born with Down syndrome â about 6,000 each year. Down syndrome occurs in people of all races and economic levels.