Oh my gosh, LOVE all of the Aria outfit photos!!! I think the Rapunzel dress is my favorite. She looks so stinkin' cute in that one!
I saw in one of your responses you were asking about places to walk/crawl while in the parks, and the first and best one I thought of is the Animation Building at DHS. Paxton had a great time practicing walking around the area up the stairs next to the Sorcerer Mickey meet & greet. There is nothing up there, so there usually aren't a lot of people (that might be where the movie lets out, I can't remember, so there are occasional influxes of people, but they moved through quickly). Another one we came across at night (not sure if it is as empty during the day but I would imagine so) is to the left of the Imagination pavilion in Epcot (if you are facing the building). It is near the fountain, and there is a bathroom off to the back, but otherwise it's just a little out of the way area with a few benches. It's outside & concrete of course, but she won't be under people's feet. We changed Paxton into his pj's over there one night and there was no one else around except for a couple of kids playing around the jumping fountains.
I remember our packing list for our first trip was HUGE and we figured out a way to whittle it down a bit for our DL trip, but just be certain that you WILL overpack! It's what we do with little ones.

Anything you can take that's disposable, that's best so you don't have to worry about losing your personal stuff (spoons, bibs, etc.) Also since Paxton was eating finger foods on our last couple of trips, the disposable placemats were great (I didn't notice if you had them on your list or not). That way I didn't have to worry about how clean or not the tables were!