Mine does the same stuff. It's ridiculous. I feel like I need a third arm to wrangle him in. If it gets really bad, I tuck his bottom arm securely either between his body & mine or up behind my cradle arm so he can't pinch me, and hook my other arm up under his top leg & using that same hand to grab the wandering hand. I don't have a lot of advice to offer ... just wanted to say you're not alone!