The New Pregnancy Nutrition Rules

... The best sources are actually beef or chicken liver, which I don't recommend during pregnancy due to their high vitamin A content (which can contribute to birth defects if taken in excess during the first trimester). Other good sources include eggs, ...

http://health.usnews.com/health-news/blogs/eat-run/2013/04/16/the-new-pregnancy-nutrition-rules?s_cid=rss:eat-run:the-new-pregnancy-nutrition-rules