E.H.
I've always heard to wait until they climb out of the crib- though it's better to catch it the day or week before that happens!!! My son it 20 months and is still in the crib. I'm thinking about getting a toddler bed for his 2nd birthday because we will be moving about that time and it will be a great gift. Also, he will be potty training, if not potty trained, by then. Good luck!!