If an 8-month-old child has fever symptoms after vaccination, most of them are adverse reactions to medication. You can give the child more water, take vitamin C supplements and closely observe the child’s body temperature. If the temperature exceeds 38.5℃, you can take oral ibuprofen suspension drops, which is mainly used for infants and children to reduce fever and can play a fast role in reducing fever. If the fever persists and is accompanied by coughing and wheezing symptoms, it is usually an upper respiratory tract infection caused by viruses or bacteria, and the blood can be checked and analyzed by blood picture. If it is caused by bacterial infection with possible fever, antibiotic drugs can be given for symptomatic treatment, such as penicillins, cephalosporins, macrolides. You can also take oral Chinese medicines, such as Pu Di Lan anti-inflammatory oral liquid, Blue Scutellaria oral liquid, Qing Kai Ling granules, Lian Hua Qing Fei granules, etc. to clear the heat and detoxify the toxin.