Ten-month-old babies are generally not prone to urinary tract infections after the MMR vaccine, which are caused by bacterial infections and are mostly related to poor local hygiene. MMR vaccine is an attenuated vaccine, mainly used for the prevention of measles, mumps, rubella, applicable to infants and children over 8 months of age, the main adverse reactions are fever, rash and digestive symptoms. Fever mostly occurs within 24 hours after injection, and low fever is the main cause. Rash mostly occurs 1~2 weeks after injection, and may subside by itself, and some children may have digestive symptoms such as anorexia and nausea. Urinary tract infection causative organisms are mostly Escherichia coli, Aspergillus and so on, due to poor local hygiene, the child does not urinate in time or prolonged urination, urinary tract infection may occur. It is recommended to take your baby to the doctor in time in order to clarify the cause and standardize the treatment.