“Moderna’s study will enroll an estimated 13,275 participants ages 6 months up to 12 years old, according to a listing on the clinicaltrials.gov website. In a post from late July, the Cambridge, Massachusetts-based company said it would seek to enroll about 7,000.”

https://www.msn.com/en-us/news/us/moderna-doubles-children-s-vaccine-trial-group-after-fda-request/ar-AANcQ8D