Is there ever a safe age to use a bumper?. DS woke continuously from 1am this morning by banging his head on the rails of the cot. Tried tucking him in really tightly but he would still wriggle around until he could go no further and end up wacking his head and hollering for help. If a bumper isnt safe what else could I try. He doesnt get wrapped and most of the safty sleep wedges here say under 6mths, he is 7.5mths.