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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 defect: Any defect present in a baby at birth, irrespective of whether the defect is caused by a genetic factor or by prenatal events that are not genetic. Birth defects may involve many different organs including the brain, heart, lungs, liver, bones, and intestinal tract.irth defects are present in one of every five babies that die in the US. How a particular birth defect affects a child varies and depends greatly on the severity of the defect and whether or not other medical problems are present.