DS is 15 months and he does it all the time. I've tried everything, distracting, saying no, removing from the situation, but he still goes back and does it.
Besides being extremely irritating I'm getting worried he may blow the tube and we're too skint to get another!
I think the only answer is to cover the switch in some way but I dunno what the best bet is; an ugly bit of gaffer tape over it or sommat? And he could probably still get at it when he realises its still under the tape!
Advice needed - thanks!