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A woman pushes a baby in a stroller past a sign hanging outside Pfizer headquarters in New York, Monday, May 23, 2022. Three doses of Pfizer's COVID-19 vaccine offer strong protection for children younger than 5, the company announced Monday, May 23, 2022. Pfizer plans to give the data to U.S. regulators later this week in a step toward letting the littlest kids get the shots. (AP Photo/Mary Altaffer)

A woman pushes a baby in a stroller past a sign hanging outside Pfizer headquarters in New York, Monday, May 23, 2022. Three doses of Pfizer's COVID-19 vaccine offer strong protection for children younger than 5, the company announced Monday, May 23, 2022. Pfizer plans to give the data to U.S. regulators later this week in a step toward letting the littlest kids get the shots. (AP Photo/Mary Altaffer)

FILE - Syringes and colorful bandages are prepared as children from local schools prepare to get COVID-19 vaccines in Pittsfield, Mass., on Monday Dec. 13, 2021. Three doses of Pfizer’s COVID-19 vaccine offer strong protection for children younger than 5, the company announced Monday, May 23, 2022. Pfizer plans to give the data to U.S. regulators later this week in a step toward letting the littlest kids get the shots. (Ben Garver/The Berkshire Eagle via AP, File)

FILE - Syringes and colorful bandages are prepared as children from local schools prepare to get COVID-19 vaccines in Pittsfield, Mass., on Monday Dec. 13, 2021. Three doses of Pfizer’s COVID-19 vaccine offer strong protection for children younger than 5, the company announced Monday, May 23, 2022. Pfizer plans to give the data to U.S. regulators later this week in a step toward letting the littlest kids get the shots. (Ben Garver/The Berkshire Eagle via AP, File)