Babies often cry after 7 days of MMR, need to be reasonable treatment according to the performance; after 7 days of MMR often cry because of injection site pain, drug allergy, but may also be caused by other reasons; common treatment, mainly based on drug therapy. 1. Injection site pain: generally no special treatment is needed, but we should observe whether the injection site of the child is pus-filled, red and swollen, etc., and take the child to the pediatric hospital for consultation if these manifestations occur. 2. Drug allergy: some children’s body constitution is more special, after the injection of MMR vaccine, if there is a rash, fever and other symptoms, can be treated according to the symptoms, for example, consider allergy caused by the rash can follow the doctor’s instructions to add cetirizine and other anti-allergy drug treatment. Fever symptoms, can be under the guidance of the doctor for physical cooling, or take ibuprofen and other cooling drugs to help lower the temperature. 3. Other reasons: babies 7 days after the MMR vaccine, the appearance of frequent crying, but also not necessarily due to the injection of the MMR vaccine, but also may be physically uncomfortable, hunger, sleep environment is not comfortable, etc., it is recommended to judge according to other symptoms. There are more reasons why babies cry a lot after 7 days of MMR vaccination, and there are more treatment methods, in case you can’t make a correct judgment, it is recommended to go to a professional pediatric hospital to avoid delaying the condition.