M.F.
My 18 month old daughter has super-stinky feet and, at her doctor's recommendation, we started putting deodorant on them before socks or shoes and it has helped a bunch. They're not roses, by any means, but at least I can stand to be in the room with her and her shoes when she's barefoot. We use Tom's deodorant on her, because I wanted to avoid chemicals and aluminum since she's so little. Good luck!