Hi Denise!
Thanks for your question and for visiting the Disney Parks Moms Panel!
My girls and I love
The Crystal Palace at
Magic Kingdom!! Not only for the beloved Pooh & Friends hugs and pictures, but the breakfast is absolutely delicious!!
Since your
Advance Dining Reservation (ADR) is for AFTER regular park opening, you will be admitted with the other guests visiting that day. This will allow you plenty of time to get down Main Street U.S.A. to your breakfast reservation.
HOWEVER, I don't think it will do any harm to at least ask the Cast Members at the Main Entrance if you and your family can enter early. The worst that happens is that they say what I just told you above. The better thing that can happen is that you ask a Cast Member who says "OK."
I personally recommend doing this, as I have done, although there is no guarantee that it will gain you early access. That said, as I tell my girls all the time, "if you don't at least ask, the answer is always no."
I hope this helps and I wish you a Magical trip!!
Chris