In my house, that simply isn't allowed. A simple, "we sit still when we're nursing" is all I do. If they won't be still, then they're not wanting to nurse, they want to play. We go play. I am a very "strict" mom when it comes to nursing manners. My oldest nursed until 38 months following the "rules". I am currently tandeming a 2 yo and 5 mo. We always follow the rules.