I've just read a similar thread and its reminded me about my DS and my worries.
He is 10mos and has just started mis-behaving - for example if you go to change his nappy he'll flip over and try to crawl away - he wiggles so much sometimes i have to let him just do it - then get him back onto his back.
What do you do to stop this? It's getting a little out of hand and he finds it funny. We have laid him back on his back and said "no" in a stern manner but he just giggles and does it again.
Obviously i dont expect him to understand but we dont know what to do. Will he grow out of this or will it get worse?