I am aware of the concerns regarding using cot bumpers but I wondered if anyone had an personal opinions on them or if they use them? I am asking because Layla keeps banging her head on the cot bars when she moves during the night (I can hear it on the monitor). Also when I go to check on her often her head is jammed against the bars and I worry about it. I am considering putting bumpers in her cot as she is 8 and a half months now