A friend of a friend's dd is 2yrs+ and naps for 2-3 hours most days and the other day slept for 5 hours in the afternoon and still went to bed and slept for 12 hours that night! Not that I am jealous at all (my dd2 sleeps about 11hrs at night and sometimes naps for an hour during the day - she is 23 months and is attempting to drop her daytime nap!
Would you be worried if yours was sleeping that much???