Believe it or not, Griffin hit the 4-week mark today.

After 28 days of round-the-clock feeding, changing and rocking, we’re still more or less sane. We think.

As far as we can tell, Griffin is doing great. He’s tipping the scales at 11 pounds now, and he seems to be getting more and more alert and interactive as time goes on. Here’s another baby gym video where it really looks like he’s visually tracking the toys and swatting them with a fair degree of coordination, even though he’s not supposed to be doing this for another couple of months. Maybe we’re just insane sleep-deprived doting parents, but we think it’s pretty cool.