It is the WEIRDEST thing ever. He did it much more often when he was little...and I guess when I would still warm up his food in the same room. He’s over 6ft now, with a nose like a blood hound. There is no need to coax him out for dinner and, in fact, it’s best to get in done as quickly as possible to avoid a run in with those chompers!
This video is a couple years old, but he does it at :49. It’s precious. It’s not a yawn; he always makes direct and deliberate eye contact, as if to say, “MOM! I’m ready!” And it is only ever in response to food.
https://youtu.be/XrWtcF-ExzA