Children 12 years of age should be aware of the precautions to be taken before immunization, such as carrying documents before immunization and staying for 30 minutes after immunization. 1. For children to receive vaccination, the guardian should fill in the relevant precautions for vaccination. 2. Bring along the child’s vaccination certificate and relevant identification documents. 3. Stay at the vaccination site for 30 minutes after the vaccination is completed to observe any adverse reactions. 4. Avoid getting water on the wound for 24 hours after vaccination, observe whether there is fever, allergy and other reactions in time, and report to the vaccination unit in time if the above symptoms occur. 5. In addition, take a light diet after vaccination and pay attention to rest.