My kids are all doing it with my grandkids.
My oldest daughter the pediatrician taught them to do it.
Interesting and useful.
But I always know when the grandkids are full before the parents catch on.....
when they start throwing the food on the floor instead of eating it!
Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.

[SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.