We had a chat with one of Sue's friends over the weekend who suggested we start Emily on a wheat-free diet. Apparently there's quite a bit of research about wheat intolerance and autism and the correlation between the two.
It's not to say that if you have wheat in your diet you'll become autistic - I didn't and Sue didn't. It suggests that if there is a possibility of autism, taking wheat out can help tip the balance.
At this point, we're eager to try anything to give Em a chance. It's all rye bread and oat cakes from here on in, I guess.