oooh I've been wondering the same thing - so glad you posted this Beatitude. Can I add a question? How long would you give them to adjust? I'm thinking I try to move him into the big bed a month before I'm due? My DS also sleeps all over the cot, typically head smushed into a corner & bum in the air. Only issues for me: I have a king single for him (and really don't want to buy a toddler bed) and I was thinking I'd put toddler rails on it. I also have a single foam mattress to put on the floor next to it in case. The other thing is that the room isn't big. So I can't have both beds in there, once the cot is gone, it'll be in the new nursery. I "think" i'll just cut him off from the cot cold turkey, is this a good or bad idea? I just can't imagine how it will work once he has the freedom to get in & out of bed himself!!