My son doesn't nod yes or no. I just noticed that.. Is it because I've never showed him how to do it? we just use words, I never thought to teach nodding..

he knows where stuff is though. like if I say do you want a snack? he runs to the cupboard, if i say do you want water, he goes over to the water filter. He knows what his toys are like if I say where is your baby or where is your truck, he brings it