OK, I put my DS (10 weeks) in his cot(foot end) in his sleeping bag tonight and he went straight down. He has a couple of monkeys at the top end of the cot. I went in this evening and he is up at the top with his head squashed against one of them. He did this last night as well and didn't creep up again once I moved him. Is this a problem do you think? I can obviously move the monkeys, but am worried he may bash his head. Bumpers are dangerous, aren't they?