Yeast rash on my baby

This is my 10month olds THIRD yeast rash. First was from thrush. I don’t understand why she keeps getting a yeast rash?? Every time I see any red flair I will use triple paste and normally if its not a yeast rash it disappears however today a huge flair came up of yeast. I don’t understand 😭😭😭 is this normal? im a FTM any other mommies dealt with this ??