He won't eat much becuase of the canker sores, and I'm pretty sure he's fussy/not sleeping well because he's hungry- hell, he's losing weight, I can tell by how tight I pull his diaper! Is there anything I can give him to eat that is easy and good...?
Vanilla Boost/Ensure drinks? Don't they have a pedi version?
Re: if DS won't eat...
I also make popsicles for my kids with pureed fruit and yogurt, half of each. My kids both love those and think they are getting a treat, and since its only yogurt and fruit its healthy! That might feel good for him too b/c its cold.
Hope he feels better soon!