Thanks everybody for all your helpful and supportive replies. My little boy has had two MRI's and the second one came back showing some thinning on the back of his brain. The doctor said this would be the cause of his delayed development, although he still doesn't know how it happened. All the experts say it must have happened during pregnancy (although they still don't know how) and whatever it was, it couldn't be avoided. I know i just have to keep positive, or even not dwell on it, but it is hard. I will take on board the advice you guys gave me, every little bit helps.