Sorry if this subject has been addressed before, but I would appreciate some advice as dh and I have been disagreeing on the best course of action. DS is 2 1/2 and is still in a cot, mainly because he has never tried to climb out and has seemed happy enough in it. Problem is, he is a big boy and physically is more like a 3 1/2 year old, so I feel his cot is becoming too small. DH thinks that instead of putting him into a bed straight away, we should put a mattress on the floor for him to sleep on but I find this idea completely wrong for ds as I know we would have a hard time getting him to stay on the mattress - in other words I think he would just keep getting up. My idea was to get a single bed and put it against the wall, with a rail on the other side of the bed so that he doesn't fall out. What does everything think is the best way? I just feel the mattress idea would not be very effective - but then again maybe I need to hear from someone who's been through it before. Thanks for your help...