It took me a while to figure out where it was coming from. I would hear it, and I'd look around, and it would stop. Then, because I have the attention span of a mosquito (or something) I would forget what I was looking for. It was yesterday afternoon while sitting with the bun in my lap that days of strange chittering and screeching were revealed to be a far greater horror than I could ever imagined: the little boy is grinding his three little tiny teeth together.
Now every time he does it I can feel my skin crawling and the hair rising on my neck. And sadly, he doesn't speak English yet, so when I beseech him to stop, he ignores me. There is a fourth tooth on the way for more grinding fun.