Hi Melissa! Welcome to the Disney Parks Moms Panel!
In a few days you'll not only be visiting the Walt Disney World Resort, but you'll also be celebrating the big "reveal!" I am thrilled for you!
For your memorable moment, your best bet is to speak with the Cast Members that are assisting at the
character meet-and-greets. Let them know what you are planning to do, and they can let you know if there are any options for the character to participate. Even just having the
PhotoPass photographers capture the moment of the gender reveal with a character, or in front of an iconic location like Cinderella Castle, is a great way to remember this moment for years to come!
As for the balloons, there isn't anywhere in Magic Kingdom Park that will be able to inflate the balloons for you. My fellow
Disney Parks Moms Panelist, Brandy, did include some great ideas for having the balloons inflated in a recent answer, so be sure to check it out at the link I provided!
I hope this helps with your magical moment, Melissa! Please visit us again with any other questions you may have!
Tabitha