Children get an appropriately smaller dose of COVID-19 vaccine than do teens and adults. These doses are delivered by smaller needles and stored in smaller vials. Scripps is only offering the Moderna vaccine to patients ages 6 months - 4 years. For this age group, the Moderna vaccine is a two-dose series (versus three doses) and has a higher efficacy rate.   Visit the CDC website for specific details about the COVID-19 primary vaccination series for children and teens.