don't worry about it. as long as he's sleeping at night with a schedule, you're fine (i only say that so you get your rest). with the naps during the day...my daughter was all wacky like that too. she would go down every 1 1/2-3 hrs, and POWER NAP for about 15 min-45 min (usually the lesser). sometimes (every couple of months,) she would get a 1-2 hr nap in here and there...but i noticed that the more she did, whether it was sitting up on her own, or rolling over more, and ESPECIALLY during her little growth spurts, she would sleep more during the day..whether it was more often with her power naps, or just longer naps in general. this is fine, normal, and i would assume happens with MOST children (if not all). i don't think my daughter was set on a schedule for day and/or night until she was about 1, but it still changes from time to time.