This is a good suggestion. Jolly Holiday is nice bakery/sandwich place for lunch. Does your child like macaroni and cheese? That is the kids option at many of the restaurants. To tell you the truth, we have found that, outside of things like character meals or the high-end places, the biggest thing that differentiates most of the restaurants are the kid's menus and what our kids will eat.
You might want to take a look at the
Disneyland dining website and see the menus for the different restaurants. That can give you a feel for the kids options and what might appeal to your child.
https://disneyland.disney.go.com/dining/