Itchy baby VJJ

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My baby girl keeps trying to scratch her vagina and saying ow ow. So we changed her diaper to a pamper thinking it could have been her huggie. I also checked her parts and it seems a bit red down there. Has anyone else had trouble with these diapers? I keep switching brands because she eventually develops a rash in her belly with her diapers. Could anything else be wrong? I already made the switch to water wipes too.