reversing a diagnosis

Hi.

Has anyone ever looked to reverse a diagnosis or felt that maybe the original diagnosis wasnt quite right?

My son was diagnosed at 4 (hes almost 7 now) and to put it in simple terms he seems to be growing out of his Autism. We know its not possible for this to actually happen but he cant possibly have developed such impressive coping mechanisms despite having a lot of support. 

I have spoken to his paediatrician who said we could discuss a reversal but suggested we wait until his next appointment to see how things progress between then.

Its quite perplxing as I certainly agreed with the diagnosis at the time but now Im not so sure. Hes still got some sensory issues but his progress in other areas has been amazing. Im pretty certain hed not get that diagnosis now.

Id be interested to hear others thoughts and experiences that may be similar.