Although my two daughters are 4 years apart, they share the same birthday so we did a WDW trip for their birthday last Oct.....Before going I bought a bright colored t-shirt for each of them and ironed on letters saying 'Today is my birthday...' on the front and '...and I spent it at Disney' on the back....They when over great as the characters could see them coming from a long ways off. We did get the buttons at the town hall but I think the shirts 'broadcast' that it was their birthday a little better. Numerous people came up to us asking where we bought the shirts.
here are some of the perks we recieved because it was their birthday....
1) got the button at town hall, and while there my daughters got a 'personal' phone call, at the front desk, wishing them a happy birthday from Goofy.
2) if your staying in the park, tell the receptionist what day your daughter will be celebrating her birthday. On the birthday when we got back to the room there was an autographed photo/card mickey & minnie in front of the castle, on their beds. If I recall there was balloons as well.
3) numerous quests, and every cast member, wished them 'happy birthday'
4) several times the cast members put us in the fast pass lane even thou we didn't have passes.
5) my daughters are pin traders, and several time a the cast member simpy gave them a pin of there choice.
6) breakfast at chef mickeys (tell the hostess of the birthday); extra attention from mickey and the rest, confetti on the table, nice autographed birthday placemats to keep, and a cupcake with a candle (I know, breakfast, but hey, its was their brithday).
7) lunch at sci-fi restaurant (tell the hostess of the birthday); public annoucnement of their birthday and everyone sang happy birthday, and a cupcake with a candle.
8) dinner at crystal palance (again tell the hostess of the birthday); confetti on the table, extra attention from pooh and the gang, a cupcake with a candle.
We topped it off with a birthday cruise (must be booked well before the trip and sells out fast) on the lake fopr the fireworks.
Note: I can't quarantee that any or all of this will happen but I am sure that if you 'advertise' you will get special attention. If you like, send me your email address (apc1@cox.net) and I can send you photos of the shirts and the hotel autographed card.