I may get a smackdown for saying this, but...
It's considered by many CMs to be in extremely bad form to demand perks on your birthday.
If a CM sees your Happy Birthday button and offers your party Fastpasses, or a cupcake, or a magical moment certificate, or a phone call, awesome! But if they don't... please don't demand it, as none of these things are something birthday guests are automatically entitled to.
The following is a transcript of an encounter that happened to me while working FastPass Return at an attraction a year or so ago. I was standing there when a party of three (mother, DD, and DS) came up. DD had a "Happy Birthday!" button on, and all three started to walk past me.
CM: Excuse me, folks. Fastpasses, please?
MOM (icily): It's her birthday.
CM: I see that. Happy Birthday, Suzie!
MOM: So she gets to ride everything without waiting, right?
CM: Well, not that I've ever been told. If that were the case, every single person here would be having a birthday.
MOM: Well, thanks for RUINING her DAY!
CM: Sorry you feel that way, ma'am. Fastpasses are available to your right. Have a good day.
The really sad part? If Mom had approached me and asked, "It's little Suzie's birthday, and I was wondering if you had any extra Fastpasses... please?" I would have been more than happy to oblige her.
Remember: Attitude is EVERYTHING.