http://www.americanpregnancy.org/birthdefects/communitybirthdefectsprevention.htm
American Pregnancy Association
Approximately 150,000 children are born every year in the United States affected by one or more birth defects. Although the cause of over 60% of birth defects are not known, there are things that you can do as a mother concerned about the well being of your developing baby. This document provides a variety of tips you can use to prevent birth defects as you contemplate starting or adding to your family.