All 4 of mine have all slept around 12 hours/night at that age, and taken a 2-3 hour nap. If yours isn't taking a nap, then 14-15 hours at night might be normal. If he's sleeping that much and not taking a nap, then yeah I would talk to the ped.
Personally, if mine aren't awake by 8 or so I wake them up so they never had the opportunity to sleep that late. It works much better with my schedule if they are awake for a while in the morning and then take a nap after lunch, but that's just so I can get stuff done while I have energy!
at 11:16 AM on Feb. 8, 2011