Diaper dermatitis, please help us!

Good day. We have a problem of the following kind: our daughter is 1 year and 6 months, for more than one month bothering her diaper dermatitis. About this disease we learned from the Internet not so long ago, I read about this disease and its consequences much. Worry about what she has been for a long time. Tried the following ointment: Advantan, Bepanthene, Cutivate (this ointment helps us for a few days, the redness goes, however, it soon appears again, he effetive, but on the advice of doctors, they often cannot be used because it is hormonal). We have a question to the experts: please tell me what an effective tool it is possible to try against this disease? Write please. Maybe there are some herbal teas, then what? And what do we do with this problem? Thank you in advance to all participants. Irina and Igor , the city of Kherson, Ukraine.