The US has an order of magnitude more child gun deaths than 28 other comparable high-income countries combined. In 2015, the US had 443 gun deaths of children aged 14 and younger. This was 13 times higher than 28 other comparable countries combined, which had a total of 34 child gun deaths in spite of having over twice the population of the US.
The US has by far the highest gun death rate of children compared to other comparable countries. Children in the US are 24 times more likely to die from guns than the children of 28 other comparable countries combined.
This study was performed in 2019 on gun violence data from 2015. Source: Violent death rates in the US compared to those of the other high-income countries, 2015/2019 Erin Grinshteyn, David Hemenway