Eh, the bigger problem with lost children is their habit of hiding or wandering back into cleared areas. Fortunately, they don't tend to wander far. Lost Person

Eh, the bigger problem with lost children is their habit of hiding or wandering back into cleared areas. Fortunately, they don't tend to wander far. Lost Person Behavior guidebook puts a 4-6 year old child at a 95% range of 5.1 miles in dry territory. That doesn't change dramatically until you start approaching teenage ages. I've posted a few criticisms of IR already in this thread. There are a narrow range of environments where it's helpful, and there's a tradeoff between image quality and flight time -- you can have good flight time and terrible image quality, or good image quality and terrible flight time.