My 3 year old probably only naps 50% of the time now. If she does nap, it is a bit later than she used to ( about 7 hours after wakeup) and I never let her sleep more than 1.5 hours for nap. i do find that if she "sleeps in" a bit in the mornings ie past 7 am she is less likely to nap, unless she has had a bad night. so basically i agree with Layla and Stacy as well, but just add as well--keep an eye on her morning wakeup time, if you want her to take a nap that day!