An ounce of prevention is worth a pound of cure.
Air flow, by means of a cheap wovened (sp) 1950 style car cushion or even the "cabbie" wooden beaded seat covers.
A great product is "Penaten-Creme". A little goes a long way.
It is made in Germany and has a higher Zinc content than allowed to be manufactured US.
Zinc kills the bacteria and other ingredients aid in the healing.
It is legal and safe to buy in the US and really works.
It can be found at;
www.natures-favor.com .
Hope it helps, diaper rash can ruin a good day.