Zoom in: In D.C., which has the highest percentage of young children vaccinated, less than one quarter of children 6 months to four years old have received one dose— and 7.5% have received both doses, per the Washington Post.

The big picture: The Food and Drug Administration in June authorized COVID-19 vaccines for children between 6 months and 5 years — about a year and a half after the first vaccines were made available for vulnerable adults.

State of play: Vaccine hesitancy is typically amplified among parents making decisions about their children's health, Blatt said.