They are sooooo cute!! Hallie looks like my Kayla.
I'm not sure there's any real way to tell how big they're gonna be. Mozart had huge paws, and everyone said he would be a big one, but he's 'standard' at 11 lbs. Ginza had very small elegant tapered paws, and he turned out to be a whopping 15 lb-er.
I noticed something looking thru the kitty albums, though. The ears seem to be a good indicator of size. Mine seem to have all had fully formed ears at kittenhood. Ginza and Pixie had huge ears, Kayla had small ears, Mozart looked 'standard'.
Not sure it applies at all, but just something I noticed of mine.