Sleep schedules change so much. Our baby at 10 months was getting up at 5:30-6, and by 13 months they sleep until 8am or so. (It's 7:45am right now and sound asleep.) Then transitioning to one nap will be like... One day the first nap will end up being 2+ hours long and they'll want to skip the second nap. Then you push that first nap back later in the day. The transition is messy and they'll probably bounce back and forth between 2 and 1 naps for a little while, which can make planning your day difficult.