Lately the little girls have had an interesting way of saying no. It's more like "naaaaaaaoww" and it's usually said while slowly (and somewhat coyly) shaking their heads back and forth. And they know they're cute and they know it's funny, so I imagine this method of politely declining requests will persist for a little while. Abigail, especially, seems to milk this for all its worth as she grins broadly during the delivery.
I suppose this is better than an emphatic "NO!" ??