A 10-month-old baby with purulent vaginal discharge is considered to be caused by infantile vulvovaginitis, infection after labia minora adhesion and so on. 1. Infantile vulvovaginitis: the vulva of infants and young children is relatively underdeveloped and cannot cover the vaginal opening, so bacteria can easily enter the vagina and cause inflammatory infections, which may result in pus discharge from the vagina. 2. Infection after labia minora adhesion: if the baby has localized inflammation, not found, usually no regular cleaning of the vulva, easy to cause labia minora adhesion. At this time if the parents did not find in time, the baby is uncomfortable easy to scratch the localization with the hand, resulting in infection, may also appear pus discharge. The 10-month-old baby vaginal pus discharge may also have other causes, it is recommended to timely to the regular hospital, complete the relevant examination, under the guidance of professional doctors to clarify the cause of the disease, targeted treatment, so as not to delay the condition.