According to this article, I infer that pediatric terrorism is:
Potential victims of an attack include children who have unique
physiologic and psychological vulnerabilities in disasters. Front-line
providers need to have adequate training to effectively participate in
local planning initiatives and to recognize and treat casualties
including children. The goal of the survey was to assess the current
state of terrorism preparedness training, including child victims, by
emergency medicine, family practice, and pediatric residency programs
in the United States and to assess methods of training and barriers to
establishing effective training.
Seriously and tragically, children can be turned into warriors. Understanding the Recruitment of Child Soldiers in Africa discusses not only the reasons for the recruitment of child soldiers, but their special susceptibility to being recruited and their effectiveness as soldiers. They are
...cheap to maintain ... and can be psychologically manipulated...
Still puzzling, though, is the question of how children can actually
be effective in direct combat, given the fact that they are smaller
and physically weaker than adults? Child soldiers are able to take
part in combat, due to the widespread and global proliferation of
small arms – mainly AK-47 assault rifles, the so-called Kalashnikovs.
“[T]echnological improvements in small arms now permit these child
recruits to be effective participants in warfare,”15 which makes them
almost as dangerous and effective as any adult soldier. Approximately
more than 70 million AK-47 rifles have been produced globally since
1947,16 and this weapon “can be easily carried and used to deadly
effect by children as young as 10.
However, the article the OP quoted is not about child soldiers, but child victims, although child soldiers are victims too.