hey!
we had breakfast last october with the princesses at the castle. my friend met us so it was me, my (then) 6 year old, (then) 4 year old twins, my friend and her (then) 2 year old daughter. they did not charge for the 2 year old, and did give her a small plate with a few of the plated items on it (can't think offhand). we gave her some more items off of our plates, and ordered any extra that we wanted (particularly the fruit, it was soooo good! the kept us well stocked), and she was given a wand for the wishing ceremony. In fact, one of the kids broke their wand or sword (can't remember which) and a server graciously gave a replacement without blinking an eye.
I loved having breakfast there before the park opened. we finished right around park opening so strolled right into fantasyland. and while my 2 boys were not huge into princesses, they ended up having a great time and loved eating in the castle. not sure norway would have felt quite the same for them.
I think the sweetest thing was how seriously my kids took the wishing ceremony. they were the perfect age, I think. they had their eyes screwed soooo tight and you could tell they were wishing hard! very sweet.
good luck with whatever you decide!
eta, we stayed at the poly last october for the first time. I got such mixed messages about when the monorail started in order to make our 8:05 seating at the castle. got one answer when I called from the room to double check (told no, we would need to take a bus), I went to the front desk to double check and was told something different (don't remember, but it was wrong), finally called my sister in VA who asked people here on the DIS...and guess what, they were the only ones who got it right! lol. so if you do go for the early breakfast, the monorail does indeed run early.