maybe consider a smoke hood rather than something that needs to fit snugly on their face
replyMira makes a few options for children. https://www.mirasafety.com/products/cbrn-child-escape-respir...
replyI have no personal experience with Mira; I’ve been looking for a respirator myself because I live in Portland.
may I recommend the 3M 6000 Series Full Face Respirator?
replysince the feds are using projectiles on random persons, something that is shatter resistant / impact tested for eye protection should be prioritized. pair with some 60926 filters and you should be good to keep resisting.