awww, he's only 10 wks old, give him a break... I remember at 10 wks old, my son was all over the place.. once he got a little older, he settled into 2 or 3 longer naps, then 2, and at 18mos, now One.. it's a process. There is a book called BabyWise, I took what I liked and left the rest behind, but it did help me understand how to get him on a schedule for his own sake. As a new mom, i had no idea how when where, etc so those ideas were a godsend. Once we sorta sleep train the baby he knew when his naps were 'suppose' to be, if that makes sense. But at 10 wks old.. he's entitled to whatever he wants. :)
my son use to sleep a good 11/12 hours at night and still take 2 1-1.5 hr naps during the day..
Gerber has a good site about sleep needs of different ages, as long as his total sleep per day totals out in a certain range you're golden. And every now and then some babies just don't require as much sleep (not as much as we need them to sleep <huggs> As long as he's growing healthily, happily, etc.. I wouldn't worry, I would just be grateful you are getting a good night sleep.