Hello, Adriana!
Mickey's Very Merry Christmas Party is absolutely magical! From the holiday treats such as hot cocoa and cookies (which are included in your ticket price) to the special parade and holiday-themed fireworks, to the snow on Main Street U.S.A. (!) this is one event that you'll talk about for years to come!
For the adults in your party, the current cost is $58.95 plus tax per person. Children under 3 do not need a ticket, and children ages 3-9 may enter for $53.95 plus tax. These tickets do sell out quickly, so be sure to purchase yours as soon as you've decided to attend.
Our very first visit to Walt Disney World was with a 3-year old and an infant; not to worry, there is plenty to do for everyone, no matter what the ages. Some great suggestions for managing the park with little ones can be found in this
In-Depth Planning Topic page. Take a look to see how the folks at WDW have really thought of everything you might need when you've tiny tikes in tow. From Baby Care Centers, to RIder Swap, attractions designed with the little ones in mind, you'll have a wonderful trip!
Send more questions as you think of them! I'd love to help you plan your upcoming trip to Walt Disney World!