I thought my LO was ready to transition to one nap around ten months too, he was really fighting the afternoon nap, however we stuck it out with two and he is back to having two fairly easy naps most days. He will protest the second nap some days but he will still eventually have it. I'm glad I didn't try to transition him too early as he still really needs the two... Not sure when he will go to one. I can see signs of him being able to stay up longer and longer without losing the plot, so once he turns one I'll lax up a bit and if he only wants to have one, then he can only have one. The way it's changing at the moment is that the morning nap has become a catnap - its about 30 mins most days, reduced from an hour. He will still sleep 1-1.25 hours in the arvo.