Baby girl private area irritation

Makayla

My baby girl is 11 months old. Tonight I noticed her grabbing at her diaper, but it was a new one. I took it off and kind of examined her down there because I knew something was bothering her. Her whole vagina area around her labia are all red. The otter part looks a bit dry too. She doesn’t have a diaper rash though. Does anyone know what might have caused that