It should not be assumed a new vaccine tested in adults will generate the same immune response in children without also testing it in children. Also, different vaccine schedules are sometimes needed to achieve a similar response in children as in adults. Children should not be vaccinated until we have proper safety and immunogenicity data.
The results of phase 1, 2 and 3 trials of several vaccines administered to thousands of adults together with the real life experience with more than 350 million of doses administered worldwide demonstrate these vaccines are safe and well-tolerated in adults. This suggests these same vaccines can begin to be safely tested in children in the near future, in fact, pediatric clinical trials are scheduled to begin this Spring for various COVID-19 currently licensed vaccines.