Both of my sons slept on their stomach. It was advised back then so that if they threw up, they wouldn't aspirate the vomit. The oldest son is 56. The youngest 51, so it didn't kill them, but the Covid shots the dummies both got just might.
“the Covid shots the dummies both got just might.”
“The dummies...”. That’s funny.
Maybe you having them sleep on their tummies made them dumb? Perhaps its time that you put them to sleep on their backs. Good luck on helping them get smarter.