My son is only a couple of months older than your child and his doctor recommended the same thing. At first, I figured why not, but as time passes and I read more I have opted not to put my son through those tests. I was advised that such tests were conducted to rule out other causes of autistic characteristics. I asked the doctor what it would mean if the brain patterns were different and he told me that we would deal with it then. No clear answer hence, no test. When it comes to situations we're not sure of, we have to rely on our instincts as parents and follow our hearts. Ask some quetions and see where it will take you. If your doctor is not willing to discuss this further, find someone who will.
Take care,
Sam
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MRI, EGG 
Linear Mode
