I found with both my girls that around 10-12 months (if I'm remembering correctly) they were ready to switch to one nap, in the afternoon. But that required me to change our whole routine. Instead of having one morning and one afternoon nap, we had one mid-day nap. I had to move up that afternoon nap because although they weren't ready to sleep at 9:30 a.m., by 11:30 or noon they were desperately cranky and needed sleep, badly. Sometimes if that mid-morning period came and they seemed tired, I would put them in the crib and just let them have some downtime for awhile--just to sit there quietly and play for half an hour or so. That seemed to help the situation and give them the energy they needed to make it through to the big mid-day crash time. Then, of course, when Baby 2 came along, I had to try and fit her routine in with our already-established routine. I've found that the nap schedule is a constantly-evolving thing that just needs tweaking from time to time to make it work for mom and kids. I'm expecting Baby 3 in six weeks and I don't even want to think about how I'm going to get all three kids down at the same time!