Other than when it is really hot (like tonight) in the bassinet we wrap him tight then wrap a sheet over him, so he cant houdini his way out.

I dont think it is the cot that will be a problem, it will be not wrapping him.I am worried about moving him to his cot whilst wrapping him, as I dont think I will be able to use this two wrap system without him getting out- the cot is a lot wider than the bassinet, so wont be able to be as tight, and then I worry about him getting the sheets stuck on his head,- which is why I wanted to use a gro bag in his cot.

Tonight I wrapped him with one arm out, and when I went in before he has two arms out. Will wrap him though with two arms after his last feed in a few minutes, so he sleeps well tonigh. Needs all he can get in this horrid heat.