Ich ergänze noch mal Baloo seine Aussage.
Mir war so, dass kids under 3 grundsätzlich "kostenlos sind". Und allears bestätigt das auch. Solange die Kinder vom Teller der Eltern essen, sind sie kostenlos. Und das nicht nur in den Buffet Restaurants.
CAN MY KIDS EAT FOR FREE?
Walt Disney World Resort Restaurants consider a child to be ages 3-9. Most restaurants have a separate children's menu with selections geared to children's tastes. Most children's meals are priced under $8, although some restaurants may have higher-priced offerings.
At table service restaurants, there is no charge for children under 3 who share from an adult's plate. However, if you order from a menu for a children under 3, you will be charged the menu price.
At buffet and "all-you-care-to-eat" restaurants, there is also no charge for children under 3 who share from an adult's plate. However, if you order from a separate children's or ala carte menu for a child under 3 (rather than eating from the buffet or all-you-care-to-eat offerings), you will be charged the price reflected on the menu.
At counter service restaurants, you will be charged the menu price if you order a meal for a child under 3.
NOTE: When making your Advance Reservations, be sure to include all children in your count of members of your party, even if they will be seated in a highchair.
Walt Disney World Dining Menus Information
EDIT: Und wirklich abwechslungsreich sind die Menüs für die Kids auch nicht. Pommes mit Chicken Nuggets oder Chicken Nuggets mit Pommes.