Big day! Sam’s about 6 1/2 weeks old now, and the greatest thing happened. I started sticking out my tongue at him, which consistently provoked one of two responses: he either gave me a big smile or else he stuck his tongue out back at me! Sounds like maybe not a big deal, but pretty great. Near as I can tell, it’s the first time that he really had a response to an overt stimulus from us (other than the occassional smile, sometimes stopping crying or sometimes starting crying :-)), and really one of the first times he got involved in playing a game. Fun!