Just as an FYI, today we managed to keep DS2 up until 10:30, let him nap until 12:30 (I had to wake him, it was almost impossible!) and then he had a 1hr nap fro 3-4. So it's very normal for this age. DS1 was ready for 1 nap at 11.5 months. DS2 is evidently ready a little sooner though I'm not rushing it. He still needs a nice big sleep at some point during the day so each day will be different.