Starting your child off on the right foot is one of the most important things you can do. Childhood immunizations are vital to helping your child avoid many serious illnesses. Start early, immunizations are also required for most Oklahoma schools. Oklahoma’s Complete List of Immunizations Immunization Schedule 0-6 years Immunization Schedule 7-18 years Behind or late on a child’s immunization schedule?Immunization Catch-up Schedule 4 months – 18 years