Children need to eat more dirt!
Years ago I had a friend and they had their 1st kid.
Kid was always sick,couldn’t figure out why.
Did all types of test etc,nothing.
Finally the went to a Dr and he asked Sams wife a bunch of questions and found out she was washing everything,all the time.
Kid dropped a rattle,wash it off,Kid drops a toy on the ground wash it off and so on.
Dr told her to cut that crap out and allow little Sammie to build up immunities to every day dirt.
Guess what?
It worked.
Like you said “eat dirt”