Oh, that's a setback Hope it's not too traumatic for you.

My kids love the coloured GF pasta. Just because it's coloured.

Buying gluten free biscuits is easy enough, but making them is even more delicious! We're not GF here, but I use GF flour often, for DHs sister and boss, and just for a change. Oh, and there's also magic bean biscuits!

Zehnder bread is what we buy for GFers, or Sol Breads. They mail order to lots of places, worth checking. Their pumpkin and rice bread is pretty good. I prefer corn thins though, I'm a sucker for those!

Dried apricots and dates will help to boost your little guy's iron count, as long as it's not too rough on his damaged gut.

Good luck. He's lucky to have you - tuned in enough to catch it early, and now to throw yourself into making it work for him. I hope the sleep improves!