If the infant still has fever even after the 3rd vaccination of DPT, reasonable fever reduction and observation are needed. If symptoms such as recurring temperature or persistently high fever occur, it is necessary to pay attention to whether the infant is in a state of illness and give targeted treatment, such as general treatment and medication. Some infants may have post-vaccination reactions such as increased body temperature after vaccination, which usually lasts for a short period of time and the general condition of the infant is acceptable. For the third dose of DPT vaccine, the above reactions may still occur. For these infants, observation can be made first and the fever can be reasonably reduced. When the body temperature does not exceed 38.5℃, it is recommended to use warm water to wipe the forehead or warm water bath to reduce the physical temperature; when the body temperature exceeds 38.5℃, it is appropriate to use antipyretic drugs such as acetaminophen to treat. If the infant has a recurring temperature, the use of antipyretic drugs is ineffective, or the mental response is poor, the infant may be in a state of illness and need to actively seek medical attention. A specialist will combine other abnormal symptoms (e.g., sore throat) and signs (e.g., bilateral tonsillar enlargement, purulent discharge, etc.) to make a definitive diagnosis and provide treatment. Acute suppurative tonsillitis caused by bacterial infections requires the use of antimicrobials, such as amoxicillin, for anti-infective treatment. It is recommended that such infants go to the hospital to be evaluated and judged by a specialist and assigned an intervention. All of the above medications should be taken under medical supervision to avoid adverse reactions.