evidence: People who are moderately or severely immunocompromised may get additional doses of updated COVID-19 vaccine 2 or more months after getting the last updated COVID-19 vaccine. [...] Getting a COVID-19 vaccine after you recover provides added protection. You may consider delaying your vaccine by 3 months. However, certain factors could be reasons to get a vaccine sooner rather than later, such as: [...] The COVID-19 vaccines for children have the same active ingredients as the vaccines given to adults. However, children receive a smaller, age-appropriate dose. The smaller doses were rigorously tested and found to create the needed immune response for each age group.