Hi! Yes, I use to hear Gracie doing that often too. When she was younger, she's much older now at 9 months
, she would sleep on my pillow with me so she was right by my ear. I would sometimes hear grinding and soon realized that when she'd swallow or lick her lips while sleeping that the noise was her loose baby teeth grinding together. I've not heard it since she's lost them all. 10 wks sounds like a little young to be working on loosing teeth, but maybe it's possible.