I'd just order the child's meal. My DS ordered from the kid's menu many nights this August, and he's 10. I've never had anyone ask his age. When making the reservation, they ask the kids' ages at that time, and sorry, but I say he's 9. He's kinda small (65 pounds) and normally doesn't eat adult size, and we don't do the dining plan ever. When we do order for him from the adult menu, trust me, they make their $$$$! We ate at Chefs de France, we got him the adult steak plus a smoked salmon appetizer, and for the 4 of us it was probably $400 with tip (DH didn't even show me the bill, and I didn't care as it was wonderful!).
Warning, we ate at Flying Fish on NYE a couple of years ago. It wasn't too crowded (it was early-ish), and it took over one hour from the time we ordered to get our food - COLD. By that time, we just ate and left. It was the worst food we've ever had at WDW, ever! I would recommend trying a different place personally. Chefs was the best, yummy, and great service! We've only done breakfast at Spoodle's so I can't comment. No we maybe had a bad night, and we didn't want to make a stink with the kids there and all, but man were they hungry! Everyone has an off day, but we're not going back.