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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 defects of the brain are a group of disorders that result from illness or injury to the brain and central nervous system of a developing fetus * . Birth defects can be inherited from a parent or acquired through the mother's contact with environmental factors such as drugs or infections.