It has been about 2 months and the little guy sure is making progress. He is an assisted sitter. He's starting to genuinely smile without it being gas. He rolled over once but I think it was a fluke 'cause he hasn't done it since. I've caught him twice making spit bubbles. The cutest though is he has figured out how to get his fist to his mouth and suck on it, although, occasionally he bops himself in the eye trying to get it there. The other day he would put his fist in his mouth and then pull it out and stare at his hand for a few seconds and then put his hand back in his mouth. It was almost like he was making the connection between the sensation his hand was feeling and what his little mouth was doing to his hand. Too cute.