Answer: ① 3% hydrogen peroxide or 1:4000 potassium permanganate solution to clean the umbilicus, and then applied with iodophor, applied with sterilized gauze until healing. The dressings in contact with the umbilicus should be incinerated, and the umbilicus needs to be incised and drained if there is an abscess; ② Follow the doctor's instructions to do a periumbilical closure with tetanus antitoxin 3000U to neutralize the free toxin that has not entered the bloodstream.