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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.
A congenital disorder, also known as a congenital disease, deformity, birth defect, or anomaly, is a condition existing at or before birth regardless of cause. Of these disorders, those characterized by structural deformities are termed congenital anomalies and involve defects in a developing fetus. Birth defects vary widely in cause and symptoms. Any substance that causes birth defects is known as a teratogen.