Newborn baby with diaper rash that comes and goes?

I have a 3 week old baby-- she has had a diaper rash since week one. I have been using Desitin which seems to work b/c the rash goes away, but as soon as I stop using it the rash comes back! I went to the doctor and they gave me an ointment to use twice a day for a week and I did, but again as soon as I stopped... show more I have a 3 week old baby-- she has had a diaper rash since week one. I have been using Desitin which seems to work b/c the rash goes away, but as soon as I stop using it the rash comes back! I went to the doctor and they gave me an ointment to use twice a day for a week and I did, but again as soon as I stopped using it the rash came back. Any ideas about this??
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