Bottoms Up

We were lying down comfortably on the sofa, little Dinky and me. He was on my tummy, face down. I asked him, it being a warm, lazy, afternoon, "Would you like to eat some watermelon, Pranavi?".

Normally, he would nod. But with his head resting nicely, I guess he felt too lazy to pick it up and nod it. So he sticks up his little bottom in the air, and wiggles it up and down, twice, to say "Yes".

I bet this one is not in the baby sign language books.