The 3-year-old child was bitten by a child, it is recommended to carry out timely wound debridement, do a good job of disinfection. Normally speaking, 3-year-old children bitten by children, generally will not have too much problem, if the skin has broken bleeding and other phenomena, it is recommended to carry out timely wound debridement, disinfection and treatment, you can use iodine povidone to carry out local disinfection, if the wound is more serious can be local suture bandage. If the child bites a child with infectious diseases, especially hepatitis, need to be disposed of in a timely manner, if their children have already played the hepatitis B vaccine generally does not lead to infection, if you do not play the hepatitis B vaccine or the wound is deeper, there may be a risk of infection with hepatitis B, you need to apply the hepatitis B immunoglobulin in time for acute treatment, and if the wound is deeper need to be injected with tetanus vaccine. Parents should take their children to the hospital for consultation and symptomatic treatment under the guidance of the doctor.