M.L.
Hi J.,
I put my 19 month old into her toddler bed at 15 months. We too have the 3 in one crib. The first night she did get up and wonder around, but we just put a rail up and then shut her door the next night. She climbed right back in her bed and went to sleep. It hasn't been an issue since. Well, I wouldn't say totally. She has gotten up a couple of times and climbed into our bed. But I don't mind that every once in a while. My kids like to sleep with us if they had a nightmare or something. So, I say it just depends on your kid, and your own gut feeling. If you think your child is mature enough, go for it. I don't think there is a magic age. BTW we have also started introducing the potty and it is hit and miss for us. BUt I am not pushing the issue right now.