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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.
Children who have genetic disorders, such as Down syndrome, often have congenital heart defects. In fact, half of all babies who have Down syndrome have congenital heart defects. Smoking during pregnancy also has been linked to several congenital heart defects, including septal defects. Researchers continue to search for the causes of congenital heart defects.