I know all babies are different but should my 10 month old still need 3 naps a day? He wakes around 6 and then wants a nap at 8.30-9.30, 12-1 and then 3.30-4.
Some days he will do a 2 nap day but that's mostly because he gets up later and so it doesn't leave any time for a 3rd nap. On 2 nap days he struggles to make it until bedtime and is asleep by 7. This then makes him wake up early and so means he needs a 3 nap day again. Also some days he will do a 2x 1.5hr naps and some days all his naps are 45mins!
DS usually sleeps 11ish hours each night with 1-2 wake ups. These are usually just easy bum pat resettles and sometimes he'll have a small feed during 1 of the wake ups depending on how much he has eaten the day before.
I read of 10 month olds having a consistent routine or going 3-4 hours between naps and then look at my DS who sometimes struggles to be awake 2.5 hours 
The other day I tried to stretch the time until the first nap so he wasn't using it to catch up on his early morning but that just led to him refusing to nap at all. He was then awake 6.45-11.30, slept for 45 mins, another sleep 2.30-3.30 and then was a mess until bedtime 