Be carefull with moskitos, there is dengue and zika.
Also, there are butterlies that bomb you with their eggs and flies that put their eggs under your nails. So, no flip flops (they should use snickers) , no short sleeve neither shorts.
https://es.m.wikipedia.org/wiki/Dermatobia_hominis
If they get this, medics are clueless at BA, but the solution is to cover the finger with grease and they go out because they cannot breath.
Of course, be carefull with snakes, spiders and pumas.
http://www.lanacion.com.ar/77343-un-puma-mato-a-un-bebe-en-las-cataratas
So, the infrastructure is children friendly but the tropical forest is not.