The CDC does an amazing job of gather stats on what kills people in the USA. https://www.cdc.gov/nchs/fastats/deaths.htm and those statistics have a section on child mortality.
Interesting, by gathering data on what kills people, they inadvertently also gather data on how dangerous guns are.
Although, props to the CDC. That is some serious data gathering, cleaning etc. Most countries don't have that level of detail. At least not publically available.
Beware of comparing the data with other countries as the definition for what looks like the same terms is hidden in the details. Infant mortality is one area where there are some fundamental differences in definition (yeah, this is a surprise). Guns are a far cry in danger from quite a lot of activities.
I restricted my comparison to homicides only. They're basically statistically insignificant compared to the other much more common causes of child firearm death.
Thanks, sorry, misread. Was asking because am curious about how the deaths break down overall as this would affect what we might want to focus on when attempting to reduce them.
