A yellowish-brown discharge from the underwear of a four-year-old girl is mostly considered to be caused by urinary tract infection or vaginitis. You need to take your child to the hospital in time to avoid delaying the condition and causing more harm to the child’s body. Common causes and treatments 1, urinary tract infection: the urethra of the child is closer to the anus during early childhood, wiping feces can easily cause urethral pollution, and parents do not wash the baby in time, it is easy to cause infection. Parents should pay attention to educate their children to wipe from front to back after defecation, and use water for local cleaning at least once a day. And promptly go to the hospital and take anti-inflammatory drugs such as amoxicillin and cefixime under the guidance of the doctor, while drinking more water; 2. Vaginitis: the child’s vulva is not fully developed and cannot completely cover the vaginal opening, which can easily cause infection, and if the vulva has poor local hygiene, it can also induce vaginitis, which can be induced by taking a sitz bath with warm boiling water and choosing a treatment plan for the causative bacteria, and drinking amoxicillin and metronidazole for bacterial infections. Candida infections are treated with local application of mycoplasma suspension. At the same time parents need to pay attention to the child’s underwear should be washed separately from the child. Precautions in daily life parents should pay attention to avoid letting the child sit directly in public areas such as public baths or hot springs, and let the child eat a light diet during treatment, without spicy stimulating or greasy food to avoid further aggravation of symptoms.