Oh, also, since it's a longer flight, they're will probably be a movie, which was a help for my older kidlet. Of course, the movie they showed on the way to Vegas was
Titanic 
soooo...yeah, not great choices sometimes but when you're sitting there doing nothing anyway, it's a time killer.
Do you know how long your layovers will be? If they're short, it may just be a quick get off, wait a bit and get back on or longer layovers will allow you time to look around the hundreds of way overpriced shops most airports have or eat or whatever.
I don't remember how many carry-on bags they allowed. I know that my son had his backpack, and I had the monster diaper bag plus my little backpack/purse thingy.I think I brought sewing stuff on the plane but I'm sure now that may be a big no-no with the sharp implements and whatnot.