Hi, John! Whenever I am trying to find information on menus, I rely on the website allears.net. If you click on the dining tab at the top of the page, you will see a list on the left side of the page giving you all of the possible restaurant locations (the theme parks, Downtown Disney, and the resort hotels). Just click on where you plan to dine, and a list of restaurants in that location will be brought up.
Each restaurant is listed with it's menus for whatever meals are available - breakfast, lunch, and dinner - and it will give you the adult menu and the children's menu, if there is a separate menu available. When you are looking at buffet type meals, there is no separate children's menu, but you will find kid friendly items on any of the buffet lines at the Walt Disney World restaurants.
I hope that helps with what you are looking for!