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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.
Birth defects are structural or functional abnormalities present at birth that cause physical or mental disability. Some may be fatal. Researchers have identified thousands of different birth defects. Currently, birth defects are the leading cause of death for infants during the first year of life.