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Birth Defects Index

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Click on the links below to learn more about birth defects.

Overview of Birth Defects

Chromosomal Abnormalities

Physical Abnormalities

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A birth defect is a health problem or abnormal physical change that is present when a baby is born. Birth defects can be very mild, where the baby looks and acts like any other baby. Or birth defects can be more severe. Read on to learn more.

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Birth defects may be caused by inherited (genetic) problems or by environmental things, such as exposure to certain toxic substances during pregnancy. Some birth defects can be linked to a direct cause. Other reasons are not as clear.