My DS was one-nap-a-day from just before 10 months and thrived on it. He was 3-a-day at 8/9 months, then 2-a-day for maybe a week then just wouldn't sleep until lunchtime so we just went with the flow. But the one nap was 2 hours or more and the three naps were 2 hours in total if I were lucky, so he hadn't really changed that much.

Sometimes he doesn't have a day sleep at all now, at 18m, but that's his choice. I'm not going to spend hours fighting him when we both want to play. OK, so I want to play while he sleeps but if it's not happening it's not happening .