I learned something new today about my little 15-week-old fetus: He or she is likely starting to suck their thumb! Now this may not sound like genius material to you, but think about it. It was only in week 12 that the fingers were really elongating and separating from one another. And it was only 7 weeks ago that the lower jaw started forming the muscles that would lead to sucking and swallowing. I think this is great progress in such a short amount of time, and quite an ingenious way to entertain his/herself. That is, between swimming laps and doing flips and twirls. Can't wait to start feeling that!