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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 or genetic disorders can also be caused by a problem with the number or structure of chromosomes. Usually this results in multiple body systems being affected. Approximately 1% of all babies will be born with chromosomal abnormality, which can cause physical problems and mental retardation. 2  More than 20% of infant deaths are caused by birth defects or genetic conditions (e.g. congenital heart defects, abnormalities of the nervous system, or chromosomal abnormalities).