a couple of things - let the young adventurer out of the pack occasionally so she/he can crawl around in the dirt some - or toddle if already ambulatory. Also, you have to regulate the kids' temperature for them, as in adjusting clothes to make sure they are comfortable. I found I really had to pay attention to this - it's easy for the kid to be hot when you are cold, or vice versa, since when you are carrying them you are working hard and they are not, and if you stop to let them crawl/toddle around, then they are working hard and you are not. Go slow, and stop often.