@petergleick In the US.
No other country has this pattern. In the UK, there were eight gun deaths of children in 2020; in Sweden, four; in the Netherlands, two. Note that the US also has enormously more motor vehicle deaths of children than comparable countries.
https://www.kff.org/global-health-policy/issue-brief/child-and-teen-firearm-mortality-in-the-u-s-and-peer-countries/

Child and Teen Firearm Mortality in the U.S. and Peer Countries
Firearms were responsible for 20 percent of all child and teen deaths in the U.S. for both 2020 and 2021, compared to an average of less than 2 percent in similarly large and wealthy nations. This …
KFF