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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.
birth defect-a defect that is present at birth. congenital abnormality, congenital anomaly, congenital defect, congenital disorder. ablepharia-a congenital absence of eyelids (partial or complete). albinism-the congenital absence of pigmentation in the eyes and skin and hair.. A physiological or structural abnormality that develops at or before birth and is present at the time of birth, especially as a result of faulty development, infection, heredity, or injury. Also called congenital anomaly.