Yesterday he ate like he was starving, went through fourteen (yes, I said 14) diapers, and took little 40 minute naps all day.
Today he is still eating like there's no tomorrow, but he is on his second nap. His first was just over two hours, this one is making swift tracks for three (at which point I'm going to get him up so he doesn't wake up too hungry), and he's sleeping very soundly. I folded a whole basket of laundry standing right next to the crib and he didn't so much as twitch.
That, my friends, signals... you guessed it...