My 14mo DS has been a nightmare sleeper and an awful napper, but recently he's started having 1.5 - 2hr naps, on his own, in his bed (with no need to resettle). Today he fell asleep in his pushchair and I even managed to carry him up to his bed without waking him (he's still sleeping nearly 2hrs later!)
He can be a pain to get to sleep at the moment (we can't find the right bedtime I think) but generally only wakes once for a feed (and he slept through once too!) and sometimes that feed isn't until 5am!
We haven't done anything to make this happen, so I am now convinced that sleep is a developmental milestone. They'll do it when they are ready!