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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.
Every 4 Â½ minutes, a baby is born with a birth defect in the United States. That translates into nearly 120,000 babies affected by birth defects each year. Birth defects can affect almost any part of the body (e.g., heart, brain, foot).auses. Birth defects can occur during any stage of pregnancy. Most birth defects occur in the first 3 months of pregnancy, when the organs of the baby are forming. This is a very important stage of development.