R..
My DD is 10 months as well, and has been starting this phase too. If she pinches or hits, I tell her 'we DON'T HIT! (or pinch, kick, whatever)' in a very stern voice, and immediately put her down and walk away from her. I still keep an eye on her, but she is very quickly learning that the behavior means no more mommy play time. I've only been doing it for about a week now, and there is a huge difference. :)