Vaccine recommendations for specific diseases will vary.  Individuals should check the Health Canada guidelines to understand if they are an acceptable candidate for immunization. Local Travel Immunization clinics are helpful sources of information.
Children under the age of 18, travelling with fully vaccinated parents or guardians are covered when:
They have been fully vaccinated according to the recommendations for their age; or
There is no vaccine available for their age; or
For children age 12 and under, regardless of vaccination recommendation.
Children of any age who are travelling alone or with parents or guardians who have not been fully vaccinated are only covered for COVID-19 or any other infectious disease if they have been fully vaccinated if there is a Government of Canada advisory in place at their destination related to that infectious disease.