I think it's different for everyone... I was wondering the same thing recently. Up until about a week ago DD would sleep from 9pm-9am, then 11-12 and then 3-5. and back to sleep at 9. Lately she has been skipping the morning and napping about 3 hours int he afternoon and falling asleep around 8 and waking up at 8:30 or 9am. I think you could try to skip her morning nap and see what happens. edited to add- DD is 10 months as well!
12/13/10 at 2:29pm