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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.
Approximately 1 out of every 33 babies in the United States is born with a birth defect. Birth defects can be minor or severe. They may affect appearance, organ function, and physical and mental development. Most birth defects are present within the first three months of pregnancy, when the organs are still forming. Some birth defects are harmless. Others require long-term medical treatment. Severe birth defects are the leading cause of infant death in the United States, accounting for 20 percent of deaths.