you are living my life on this one. I have battled issues with this in my 6 year old daughter for 2 years now! We have done everything you talk of and nothing...we tested for lactose intolerance, high blood sugar, etc, etc...until I changed to a female pediatrician last year! My daughter has a little issue down there that isn't a deformity or anything, her parts are just a little higher up and therefore urine can get caught in the "pocket" a bit more. then it irritates the skin. Sorry, I am trying to be discreet, you can Privite message me for more info if you want. This all might seem a little extreme, but its working. Here is what we have to do:
1. Baths are better because the water gets up there and gets it clean. NO BUBBLES! I was shocked when her dr. said that, because I had been told NO baths! But it does help...for ease of schedule, I do bath one night and shower the next. clean every day.
2. Dove sensitive skin soap, not baby wash. Even baby wash has sents in it that can irritate the skin.
3. Clean panties in the morning and clean panties before dinner. Sounds extreme, but its got to stay dry down there. I dont know what time you get home, but I have her change her school clothes when we get home including panties.
4. Diaper cream, not medicine. It works great. I actually just had my doctor recommend it for adults too for the occassional irritation (sorry if TMI).
5. Acidophilus milk.
6. Use Periwash spray in between bathing. Its normally for people with incontinance. I got it from a friend who has a disabled daughter. It works wonders! Just spray on her parts and wipe clean. They also sell wipes which might be a good idea. http://www.amazon.com/gp/product/B000GCRXQQ/ref=pd_lpo_k2...