We started sleep training for Theo this week. Overall he has done really well, and he now naps during the day for 35 minutes to an hour and half at a go instead of 20 minutes with lots and lots of assistance (bouncing, pacifier, shhing, etc.). He sleeps tolerably well at night, too, and seems in general to be improving. At the very least he's not up every two hours, which got old very quickly for everyone. As a bonus, he often wakes up cooing and happy now instead of upset.