Think of all the traditional sources concerning the effect of the behavior of a pregnant woman on her fetus. And then read this: http://edition.cnn.com/2011/12/11/opinion/paul-ted-talk/index.html?hpt=hp_c4
Editor's note: Annie Murphy Paul is the author of "Origins: How the Nine Months Before Birth Shape the Rest of Our Lives." She's now working on a book about learning, and writes a weekly column at Time.com called "Brilliant: The Science of Smart." TED is a nonprofit organization dedicated to "Ideas worth spreading," which it distributes through talks posted on its website.