A.P.
I thought the same thing when we switched my son...we have a few nights where he would not stay in it but now it is not bad when it is bed time he usually goes to sleep. It was like an achievement for him to get a big boy bed. Just remember because you transition to a big boy bed does not mean you cant but the crib back up. My nephew refused to stay in his room or his bed at nighttime so my brother took the knob off the door on the inside of the room and would shut the door...after a few nights of sleeping on the floor my nephew slept in his room. Good luck