I agree with pp. My older dd who was always a super sleeper--well, we had to stop her nap at 5! But with 2 year olds you usually encounter some nap resistance, and napping can become trickier, because if the timing is off--you put them down at the wrong time or they've slept in in the morning--they won't nap. I think then people assume that there lo is "dropping the nap" but they're not really, you just have to work at it a bit.