Claw that is a really difficult question!
DH & I were discussing the other day he wonders how much of the progress has just been natural development, but I actually think that without the intervention DD would have been getting worse by now. But what it was exactly that made the difference I am honestly not sure
Dd's gravitational insecurity was apparently the worst the OT had seen in 20+ years of
practice, and her balance was so bad that even seeing the wobble board or a wheelie chair made her shake with fear and lash out really agressively. However it happened, over the course of a few weeks, her desire to overcome the fear grew stronger and she managed to do things she had never done before and the pleasure & confidence this gave her was immediately obvious. After a few sessions we came out and for the first time in her life she ran ahead of me to push the button the traffic lights and I burst into tears I was so happy for her! She had never before left my side when we were outside the house and always held my hand as if her life depended on it. She herslf knew that something was happening and really wanted to go to OT and always asked when we were going back.
On the other hand we had a couple of very rough weeks when the OT did the sesssion with a visual timetable and started to challenge DD's control which was quite horrible to watch, but was also a major turning point
Apart from that I think the way that I dealt with DD changed completely - I freely admit I was getting frustrated with her without understanding what was wrong, and once I did more or less understand I think it must have been a relief for her as well as me
She is so aware of her difficulties - the first time she wrote an X, for example, she knew she had done something momentous
So this is the child who at 3 could barely get up& down stairs, but at 4 had her birthday with 10 friends in a soft play and was flinging herslf down tube slides with the rest of them. She still has a very long way to go with her speech, but her physical difficulties are pretty borderline - she still looks a bit dyspraxic when she runs & sometimes still clenches her fists a bit, still doesn't like a bike much but prefers her trike, she doesn't have much upper body strength, would always hold on going down stairs
We are pretty sure she has APD though with so little speech it is difficult to test and she is certainly less noise sensitive than before. Her tactile issues seem to have gone( we also did brushing though adnittedly not for more than a few weeks). Her self regulation is fine, even though she does get frustrated at times it is not the major isssue that it was. She seems to have no fear of going to strange places, but rather enjoys it and wants to go. Her stamina is getting better though she does get tired - but she's only 4 1/2 !
Very interested to know how your DS has progressed since his DX? is he having therapy at the moment?