Jane Ellen Norman, 12, holds vaccination cards for her and her 14-year-old brother Owen outside Mercedes-Benz Stadium in Atlanta on Tuesday, May 11, 2021. The two were vaccinated Tuesday morning, after U.S. regulators expanded use of Pfizer's COVID-19 shot to those as young as 12. (AP Photo/Angie Wang)

English Norman and her 12-year-old daughter, Jane Ellen Norman, pose for a photo outside Mercedes-Benz Stadium in Atlanta on Tuesday, May 11, 2021. Jane Ellen and her 14-year-old brother Owen were vaccinated Tuesday morning, just after U.S. regulators expanded use of Pfizer's COVID-19 shot to those as young as 12. (AP Photo/Angie Wang)

Jane Ellen Norman, 12, poses for a photo outside Mercedes-Benz Stadium in Atlanta on Tuesday, May 11, 2021. Jane Ellen and her 14-year-old brother Owen were vaccinated Tuesday morning, after U.S. regulators expanded use of Pfizer's COVID-19 shot to those as young as 12. (AP Photo/Angie Wang)