Yes. If your toddler hasn’t already gotten them in the past few months, at 15 months your toddler will need booster doses of certain vaccines, such as those that protect against meningitis and pneumonia, as well as shots that help prevent measles, mumps, and rubella as well as chickenpox and hepatitis. Check with your child's healthcare provider to find out when these shots will be given. It may be during the 15-month checkup.