German researchers studied 60 French and German newborns and found that the babies cried with different accents. They believe babies pick up the inflection of their mother's voice in the womb and imitate it in an attempt to bond. [BBC]
Because they always do such an interesting job picking apart the BBC's crappy Science Journalism, here's the Language Log take on this. [languagelog.ldc.upenn.edu] "...it's not clear to me why the authors reject without explicit consideration the hypothesis that the babies were responding to a few days of French vs. German "motherese"."
And, I now see it's already been posted before, so I'll try to add something else. Another linguist's take is here [phonetic-blog.blogspot.com] , and the abstract for the article under discussion is here: [www.cell.com]