We are 20 months now, and we are still using a sleep sag! As winter is approaching, I am very tempted to buy a down comforter for LO, but not sure if that will be too early! I also wanted to buy him a pillow, but so far he's still sleeping / rolling around everywhere in the crib, so I don't know how much use that would be.

When did you transition from a sleep sag to a toddler blanket/comforter? OR should I keep the sleep sag for as long as I wanted, and get a thick blanket as an addition? Any advice to ensure success ??