We were in WDW the week b4 DD's bday. We chose the last full day of our trip for her special 'birthday celebration day'. This was the day we got her a bday pin from City Hall, did CRT for breakfast and Chef Mickey's for dinner. (We only had one other special meal in our 6 day trip). Make sure to tell dining when you make reservations that it's for his birthday. At CRT, our table was decorated for us, and DD got special attention from the princesses. She even got a birthday kiss from Aladdin and BOY was I jealous!
At Chef Mickey's, Goofy and Mickey did a special birthday dance for her in our section of the restaurant.
All the CM's wished her a happy bday, and she got to say 3-2-1 Blastoff! at the Astro Orbiter.
It was a ton of fun. Make sure he's wearing that b-day pin!