Okay I wasn't gonna post it but I will. I need help. I feel like such a bad mother. I honestly let…

Okay I wasn't gonna post it but I will. I need help. I feel like such a bad mother. I honestly let my daughter sleep through the night in a disposable diaper. She slept 9.5 hours last night. I give her a bath when she wakes up. Never had a problem. Well apparently she didn't have a disposable on and hag a cloth diaper on. immediately when I zipped down her sleeper I felt bad. I take the diaper off and bathe her. After her bath I notice a small piece of skin rubbed raw on her bottom. What can I do to help? It doesn't even seem to bother her. I have her naked right now and I put coconut oil on it.