A tetanus shot usually refers to the tetanus vaccine, which may be needed for a child who has three stitches in his chin. There are two types of tetanus vaccine, tetanus antitoxin and tetanus immunoglobulin. The tetanus vaccine prevents the patient from being stabbed or scratched by metal products that contain rust or soil contamination. The tetanus vaccine can prevent the tetanus bacillus from invading the human body and producing tetanus symptoms, so as to prevent the child’s chin from being in contact with items carrying the tetanus bacillus after it has been broken and not being inoculated in time, which will increase the chances of the child’s body developing tetanus. If a child’s chin is broken and he has three stitches, he should not only get a tetanus vaccination, but also pay more attention to the hygiene of the wound to avoid inflammation and infection of the wound.