http://kidshealth.org/parent/system/ill/birth_defects.html -probably the best site for information! Especially on how genetics cause birth defects!!
http://www.birthdefects.org/
http://www.medicinenet.com/birth_defects/article.htm
http://www.cdc.gov/ncbddd/bd/default.htm CENTER FOR DISEASE CONTROL
http://www.cdc.gov/ncbddd/birthdefects/default.htm _ there is list here that you can click on your birth defect if it is listed
http://www.birthdefects.org/
http://www.medicinenet.com/birth_defects/article.htm
http://www.cdc.gov/ncbddd/bd/default.htm CENTER FOR DISEASE CONTROL
http://www.cdc.gov/ncbddd/birthdefects/default.htm _ there is list here that you can click on your birth defect if it is listed