Sudden picky eating

So my 17mo suddenly has decided to be picky. I suspect maybe hes teething but he usually eats pretty much anything with only a very few exceptions. But the last week or so he has refused any bread and most meat. Things he normally likes he is suddenly refusing to eat. Instantly spitting it out and refusing to self feed the food. I really am at a loss. I'm very tired of having to fix him something else. My older son is extremely picky so idk if my younger son is mimicking him or what. I'm about to scream