I was once on an easy, ranger-led "family hike." Because it was the middle of the day, we didn't see very much wildlife. The ranger pointed out what kind of animals lived around there by pointing out their droppings...deer, coyote, owls. Every few minutes we would come across some more "scat," as the ranger called it.
Finally one little boy said "Daddy, how come there is so much POOP out here?"
It's not that blogger's kids are so sickly or disgusting. It's just what people talk about.