Devin nods his yes whenever I ask if he wants milk. Well, not just his head. He nods his whole body with great purpose.

The only thing is that he never really seems to want milk. He just wants to nod yes when I ask if he wants milk.

I think I may have inadvertently taught him that a head nod means milk one day. I asked him over and over if he wanted milk while nodding my head and saying "yeah." I think he associated "milk" instead of "yeah" with my nodding head.