Well I have three small kids, 5, 3 and 10 months and we like to eat at:
Storyteller's Cafe (character breakfast and order off the menu) but we also like it here for lunch (a wonderful turkey sandwich) and the kids like dinner (make your own pizza!)
We also like Carnation Cafe. The pretzel bread for the sandwiches is great here, and the kids love the PB & J painters palette for lunch.
We also like to eat at Whitewater Snacks in the Grand! Wonderful food, huge prtions and great prices!
Another favorite for us is Pizza Port. Both of my girls really like the chicken pasta here and so do I, although the atmosphere is not my favorite.
I don't know about your kids but mine do not really care for the mac n cheese there, and nuggets get old quick so we like these so that we have a few more choices. We also like to eat at the Sourdough Bread Co in DCA, and the kids like the burrito at the Mexican restaurant right by it!
Good luck, there are tons of choices out there, and we are going to try some new ones at DTD this time~
Andrea