DD has this all over her top half at the moment (front and back), around her legs and through her hair.
I give her cool baths with QV often. I only put a nappy on her when I can (or no nappy at all) If it's really bad I put some paw paw on the really bad parts. I try and keep the place cool but I can't fix it in the car etc - shes like A and gets it really quickly in the car. Goats Milk soap is also really good (just check it's pure goats milk soap - it shouldn't be pure white)