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Birth defects (or congenital defects) are defects in a baby at birth, or which develop in the first month of life. There are two main types of congenital defect. The first is caused by genetic abnormalities, which are hereditary. The second is caused by conditions (such as infectious diseases) which a baby gets from its mother. Sometimes doctors can find out that a baby has a congenital disorder before its birth.
This article is about congenital disorders in humans. For animals, see Teratology. 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.