Stay for half an hour after the MMR shot at 8 months while learning about adverse reactions. 1. Stay for half an hour: After receiving the MMR vaccine, you should be observed for about half an hour at the healthcare facility where the vaccine was given, and you should not leave until you are not otherwise uncomfortable. 2. Learn about adverse reactions: (1) Pain at the site of vaccination and pain to touch will occur within 24 hours after vaccination, which will usually subside on its own within 2~3 days. (2) 1~2 weeks after vaccination there may be a transient fever, generally do not need special treatment, drink plenty of water, pay attention to nutritional balance, the body temperature exceeds 38.5 degrees, timely medical treatment, you can take physical antipyretic methods or medication to reduce fever, symptomatic treatment. (3) Vaccination may appear scattered rash, pay attention to hygiene, usually will subside, do not need special treatment. (4) Individual children may also have mild swelling of parotid and salivary glands, which will generally improve within a week. 8 months after the MMR, if the baby appears uncomfortable symptoms, should also promptly consult a doctor, follow the doctor’s advice.