R.M.
Hi M. Y-
10 months is a little young to give up the morning nap. At this age your child should be getting 14 hours of sleep a day, night & nap.
I recommend to the parents I coach (I'm a parent coach), to set the nap time back 15-20 minutes until you find the right fit. Kids change their nap needs quickly. I've found that if you miss the "nap window" the child gets over tire and cannot fall asleep.
I would expect your son to go to 1 nap around 15-18 months, but not before.
As for night time, again, try to lay him down earlier in the evening. If he wakes early, lay him back down. He may not know how to comfort himself back to sleep if he wakes early. I always suggest parents use a music CD in the child's room. It helps the child learn when it's bedtime and drowns out other noises.
R. Magby