Bet you haven't had this question before!
My daughter is turning 6 in December. She is riding in a standard riding helmet but we have a problem. Her face is thin and bit long so when she wears her helmet, it slides back like a beanie! It doesn't offer as much protection as I would like because it doesn't fit her well. I've tried tightening it in the back by twisting the band tighter, I've tried adjusting the chin straps...NOTHING WORKS! Bless her, she's a beautiful girl but looks goofy (plus very little protection!) when she is wearing her helmet.