I'm fairly confident we have made the right decision.
DS4 will be two 0n the 23rd, he has GDD, hypotonia and hypermobile joints. His hypotonia is improving and he is much stronger, he crawls, climbs and stands now. This morning he climbed up the stairs by himself. At his last developmental test he came out at about 16 months - a huge improvement. His speech is starting to come now and he has a few words and signs. Most importantly he is a happy, bubbly little boy with a great sense of humour and great determination.
Having a DX for his condition will not make the slightest difference to who he is. As long as he continues to progress as he is doing now we will be happy.
The MRI would check for brain damage. It would involve a GA, very low risk these days but still an unecessary one. DH and I both agreed that maybe in the future, if the improvement stops or degenerates, maybe then we'd want further investigations.
Is this the right decision? My only nagging doubt is that perhaps the MRI would reveal a condition that could be treated in some way and we would miss it.
Would be interested to here other experiences of MRI scans and what they revealed.