is this dangerous at 6 months? I find I spend all nitgh going adn turning him back over - I'm scared he'll either sufocate when face down - or i hear the thump as his arm gets stuck in teh cot bars......he's too young for cot bumpers and can rol in his growbag - but unfortuntaly only teh 1 way. just when I thought i might get some slepp at long last.......:-))