Well, since he napped for 1.5hrs, he's probably good for that cycle, but since he's up an hour before the next feeding, you'll need to consider that in your total A time again when considering the next time. As for timing of naps, every 2 hrs would be based on a 4 hr feeding schedule, assuming he can stay awake for 2 hrs. He might be only able to tolerate 1.75 hrs of A time, and that's fine. He might not sleep all the way to the next feed on that routine each time, but a 1.5-2 hr nap each cycle would be your goal. So, say he's up at 8 am, will be ready to nap by 9:45-10, hopefully sleep somewhere 11:30-12, eat at 12, ready for next nap 1:30-2, hopefully nap until 3:30 -4, eat at 4. That is a very broad generalization and does not mean he should be sleeping that long. But, of course, you want to try to get him to sleep past the first 45 min cycle, and should try for at least 40 mins.