the right hand and left hand thing isn't meant to show through until someone after 2?? That's what I've heard/read anyway.

Also I wouldn't worry about the thumb sucking. Matty was sucking his thumb alot when he was around 3 months, everyone commented that he would be a thumb sucker and oohh I am going to have trouble getting him to stop and oh why didn't I get him to use a dummy?!

Matty is now 8 months and doesn't do it at all. It did last a few months though.