Maxwell's milestones seem to be instantaneous. Either that or I'm just a very inattentive parent. For instance, a few weeks ago he just started sitting up. He never went through the tipsy or slouchy stage. He just sat up one day like a pro.
This new trick was the same. We were getting ready to leave my parents' house, and he just started playing his favorite game. Surprise! Now he wants to play all the time. He even yanks on the collar of his shirt to try and cover his face. It's pretty stinkin' cute!