Introduction to baby girl\’s fart rash. Baby girl\’s fart rash is a skin inflammation caused by factors such as immature gastrointestinal and defecation systems, friction from clothing, intrusion of dirt, and bacterial or fungal infection, especially in the back and diaper area. . Typical symptoms of rash include redness, edema, bleeding, pain, itching, and flaking of the skin. At the same time, it can also cause discomfort and pain to the baby, affecting the baby\’s sleep and mood. The cause of fart rash in baby girls. The cause of fart rash in baby girls is usually due to diaper friction.