ds has just started using his big cot for naps, not sleeping overnight in it yet. he often wriggles and pushes himself so that his head's squished up against the bars or he ends up with an arm or leg sticking out, and starts crying. is this normal? do cot bumpers help - i'm sure i've heard somewhere that they're a bad idea...
(the cot is a new one and the bars are a safe width apart)