J.S.
Our general rule has been that when they're not safer in a crib (i.e., they climb out) it is time for a toddler bed. That has been a different age for each of our kids. I have wanted them in the crib as long as possible so I didnt' ahve to worry about them wandering aroudn. If he is already doing well on a pull-out bed, though, go for it! Maybe it woudl help him sleep better at night in his own room.