I can't believe my 18 month old is already in a big boy bed! We didn't move the twins into beds until they were 22 months old. And, even then, all we did was take the side railing off the crib until they got used to the idea. We had to do that out of necessity... Samuel was climbing out of his crib & getting stuck at the top of the railing. However, with Nicholas, we just took down his crib temporarily to set up the bed for guests. But, he loves his big bed, goes down easily in it, hasn't tried to escape (yet!) and stays there until it is time to wake up in the morning. So, we decided to go ahead & leave it in his room. I knew it was just a matter of time before we would have had to set it up again anyway, so I guess this saves us some trouble later on down the road. It just makes him seem so much more older now... which, in turn, makes me a little sad. I'm not ready for my baby to grow up!