The large red areas on both sides of the baby’s urinary tract may be related to contact friction, eczema, vulvovaginitis and other causes. 1. contact friction: if the diaper and the baby urinary tract on both sides of repeated contact friction, may cause vulvar redness. 2. Eczema: If eczema appears on both sides of the baby’s urinary tract, it may be manifested as skin pimples or herpes papules, etc. The lesions may be accompanied by redness and swelling at the same time. 3. vulvovaginitis: the baby’s urinary tract on both sides of the attack by bacteria and other pathogens, can appear inflammatory reaction, manifested as localized redness, swelling, itching, pain and so on. Parents are advised to take their babies to the hospital in time to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor to avoid delaying the condition.