Hello. just wandering about my baby who has recently started pulling up- on anything and everything. I can't leave him for a second as he keeps tumbling and crashing his head into things all in his rush to get onto his feet. In his cot he has started pulling up as I try and get him off to sleep. I leave his room only to find him climbing the sides. I'm worried he'll lose balance and crack his head on the cot sides? Any advice?