Children fall inside the lip has a mouth need to be treated according to the depth of trauma, such as epidermal damage, local swelling, muscle layer damage, etc., the treatment includes cleaning and disinfection of the wound, medication, surgical closure and so on. 1. Epidermal damage: there is a wound inside the lips but the muscle layer is not injured, you can first clean the wound, use iodine povine to sterilize the local disinfection, after cleaning the wound, if the lips bleed, you need to use clean gauze to stop bleeding by pressing the wound. 2. Local swelling: After cleaning and disinfecting the wound, local swelling and pain may occur in the later stage, you can take drugs under the guidance of the doctor to reduce swelling and pain relief. 3. Damage to the muscle layer: the wound inside the lip is large and injures the muscle layer, requiring surgery to close the wound. To take the child to the hospital in a timely manner for debridement suture surgery, post-operative attention to wound cleaning, to avoid infection, if necessary, but also to play tetanus vaccine. When the child fell inside the lip has a mouth, parents are advised to take the child to the regular hospital in a timely manner, under the guidance of a professional doctor to deal with.