I'm going to do a poll. Is your LO a leftie or a rightie, if you can tell? And also, when could you tell?
I also wonder if gender plays a factor. More left-handed people I've met have been male.
Fun factoid? DH said all (or was it most?) U.S. Presidents have been left-handed, and LH boys are more valuable in terms of sports playing because they're unpredictable. But don't hold me to that!