Thanks everyone for your replies!
Lucy slept through last night so maybe I will not need to add cereal. Hopefully it was not just a fluke!
She likes oatmeal cereal and she is using the number 3 Dr. Brown's nipples so I will go ahead with the cereal if I have to. Of course, the day before we are to go to the specialist she ate her breakfast quite well. I was utterly shocked. I will keep the appointment though as I am sure they will be able to give me some good information.
Daniela - The weather was nice in Vegas but it definitely was not a good place for a baby! She had trouble with the time difference so she was quite fussy. It was neat to see the various hotels and casinos but I think we really would have enjoyed the gourmet restaurants and the shows. But we could not do those things because of the baby so it was not as fun. But it was nice to get away for a bit. Thanks for asking!
Thanks again everyone!