I did mentioned I have no kids, right?
So how do I know what you should pack for your kids? I’m just guessing.
Since their clothes are small, grab everything you can, stuff in a carry on and get going. NOT REALLY.
I have created several pages for packing that you may want to look, it’s always hard to figure what to pack and not to pack. My best advise, start early, I don’t mean early on the day you are traveling but early in the week, so you can decide with time what you can take and what you would like to take.