There are really no restaurants at WDW that are kid un-friendly except maybe V&A. The real question is what will your kids enjoy.
I'd go for character and theme stuff with young kids. The characters are very good about being sensitive if the little one is frightened of them. 1900 Park Fare had primarily face characters (princesses, prince charming) so that they look like people. Yes, the mice are there too. Some little ones love the characters, others are a bit skittish.
50s Prime TIme is another fun place for kids. WCC is fun, but we didn't care for the food.
Really, WDW is a wonderful place for kids--they are welcome everywhere.