I can write properly now - no baby on lap ...
We did Scotson technique for 3 years. DS was 18 months when we started.
He has CP and was delayed with speech. I am sure it was the Scotson that started him talking. We were bringing extra blood flow, through massage, to his lungs and diaphragm. It seemed to make a big difference.
Linda Scotson says that the technique helps to strengthen the trunk and motor planning. I would say my son has amazing motor planning considering that he has very little use of his left side.
BUT we have done tonnes of oxygyen therapy with him too (at the WAlthamstow MS action centre) and that made a enormous difference to DS. Its difficult to say whats done what.
Now we are doing reflex inhibition therapy, and I would say that this would probably be more use to your DS than Scotson. Obviously I don't know him, but I am guessing that he has full use of his body ...? Is he co-operative to a certain degree? My DS needs lots of encouragement and bribes - but now he has greater use of his whole body I think that this is more useful.
Scotson was great because it is a passive therapy and I think when DS was younger (he is now 5) he could not have done anything that involved instructions. However now that we can do active therapy, I believe, that active therapy has more benefits than passive - I hope that makes sense.