We haven't moved into a bed yet, but we are planning on using the trundle part of the single bed we bought in the first instance. Its low to the ground so not far to fall if he does. We got our bed from Super Amart. Originally we used the bed as a single or a double (it can be raised to the same level as the other part of the bed) As he gets older he will move into the single bed and the trundle part will be used when he has sleep overs with his friends. I figure he will be able to use it until he moves out of home.