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[https://www.timesofisrael.com/pfizer-testing-3rd-covid-vaccine-dose-for-kids-under-5-after-setback]
"Pfizer said Friday it was changing plans and testing three doses of its COVID-19 vaccine in babies and preschoolers instead of the usual two.
The addition of an extra dose came after a preliminary analysis found 2- to 4-year-olds didn’t have as strong an immune response as expected to special low-dose shots.
Pfizer had planned to release data from its study of children under 5 by the end of the year. It’s not clear how this change will delay the quest to vaccinate the youngest children.
Pfizer and its partner BioNTech said if the three-dose study is successful, they plan to apply for emergency authorization sometime in the first half of 2022."