It could be the Dreft, we use All free and clear and love it! We are still in diapers but the Dreft does have fragrance in it so that could be what is causing the irritation. Also, check to make sure those undies are 100% cotton, some of those that they make cheap are not!
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Kati, Mom to Kennedy Jane (March 2007 -- unaffected) and Kallie (May 2009 -- collodian layer and no diagnoses yet)