Start with Britannica.
Look here for overview information Don't forget that Britannioca will often provide links to journal articles as well as recommended websites.
Great database for this project!
You'll find reference information, images, journal articles, videos, etc.
Find the facts in the Facts on File health database.
Find information on birth defects, as well as charts, diagrams, and pictures.
Gale Virtual Reference Library eBooks
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Search for birth defect information in the virtual refererenc library. These books can be accessed from any internet enabled computer, 24/7. Just type in "birth defects" or specific types of birth defects for multiple books.
Try Sweet Search instead of Google.
Try Sweet Search - an academic search engine with a good collection of reliable websites.