Wow, you're ambitious! It's commendable that you've chosen to expose your kids to the wilderness at such a young age. I hope that when we have kidlets we can do the same...

Just curious, how old are the kids? Obviously one is a toddler and another a baby, but are the others old enough to carry a light pack? Kids generally don't need as much padding as adults for sleeping pads, so they might be able to carry at least their own closed-cell foam pads and a small water bottle...