Re: When to move to a toddler bed...
We moved DS1 into his big boy bed when he was 15 months old because we just moved to a new house and I was due in 3 months and so we decided that since it was a new house he deserved a change and we also didnt want to set up the crib in his room only to take it down and bring it to his new brother's room.
He adjusted very well. We used side rails and just made sure that his room was baby proofed. We also put an open toybox in the corner of his room.
I don't know it worked for us and he loved the freedom.
He used to wake me up so early when he was in his crib but as soon as we brought him into the big boy bed he'd quietly play with his toys in the morning and let me sleep for a little while longer