As of 2020, more children die each year from gun violence than from car accidents. We do a lot of things to prevent car accidents and to make cars more safe: child safety seats, seat belts! speed limits, automobile design! traffic control! Lots of things.
This is lumping all minors together, not just children proper. When you get into teenagers, esp. above the age of 15, you get a lot of gang or other criminal activity which increases a chance of gun-death considerably. A 17 year old has a six times higher chance of dying by a gun than a 13 year old, and it's not because Salvador Ramos and Nicholas Cruz types predominately attack senior class home rooms.
How many of these numbers are by so-called "assault weapons"? How many are from school shootings like the ones in Uvalde or Sandy Hook?
We know that overall, only a small fraction of all gun homicides, and a minority of even mass shootings, is committed with a so-called "assault weapon". And even with those where an AR15 or similar was used, the perp could have switched to a handgun if his weapon of choice was not available due to the renewed ban.