B.K.
I'm going to repost some info, hope it helps.
According to a great book "Healthy Sleep Habits, Happy Child" by Dr. Weissbluth, here are the stats: Mos. 13 to 15 - 1% have 3 naps, 43% have 2 naps, 56% have one nap. Mos. 16 to 21 - 23% have 2 naps, 77% have 1 nap at 18 mos.; 12% have 2 naps, 88% have 1 nap at 21 months. Mos. 21 to 36 - 5% have 2 naps and 95% have 1 nap at 24 mos.; 0% have 2 naps, 91% have one nap and 9% have no naps at 36 mos. On their third birthday, most children (91%) are still napping every day. At age 4, about 50% nap 5 days each week, and by age 5, about 25% are napping about 4 days each week. Naps are usually gone by age 6.
Hope this helps.
Bernie