We put DD1 in at 14 months and DD2 in at 16 months. It was easier with DD2. We put a gate on the door when DD2 started getting out of bed regularly. We shut her door overnight (she wakes up DD1 otherwise). It took a week but now she doesn't get out when going to sleep so we took the gate off. She slept fine in the bed from the first sleep in it. Good luck with whatever you decide. I found it just fine with both girls and it was nice not having to lift them in and out of the cot anymore