Birth defects are defined as abnormalities of structure, function, or body metabolism that are present at birth. These abnormalities lead to mental or physical disabilities. There are more than 4,000 different known birth defects and they are the leading c

Birth defects are defined as abnormalities of structure, function, or body metabolism that are present at birth. These abnormalities lead to mental or physical disabilities. There are more than 4,000 different known birth defects and they are the leading c