Hi, Joyce!
How exciting that your darling little prince is turning 3! He must be so excited for his birthday.
Will he get in free? The answer is "maybe!" If he is 2 when he arrives, he "stays" 2 for the entire vacation with no need for a park ticket. If he 3 upon arrival, then he will need a child's park ticket.
Mickey Mouse loves celebrating birthdays! Stop by any guest services location for a FREE Happy Birthday button. Tell you server at any table service location that you have a birthday boy and they might bring out a sweet treat to celebrate at the end of your meal. You might want to bring an oversized birthday card with you. In lieu of an autograph book, have the characters sign the card for a great keepsake for your son's 3rd birthday!
If your little guy likes the Disney Channel, you might want to make a visit to Hollywood Studios. Here, you can see Disney Junior, Live on Stage with some of your favorite Disney pals. You might also want to book a reservation for breakfast or lunch at
Hollywood & Vine where more of your Disney Junior pals will be on hand for a super fun meal and they will even come to your table for photos and autographs.
However you decide to celebrate, I hope your son's birthday is extra magical. Wish him a very Happy Birthday from all of us here at the Moms Panel!