My DD needed spinal galant reflex integrated. I thought it sounded woowoo, but my DD was unable to sit with her back to hard chair and once reflex was integrated, she could.
I used to complain, bribe her, etc. About the way she sat. Nothing would help. I didn't mention to OT as an issue, and didn't put it together until they talked about signs of uninterrupted reflex.
There was also a distinct sign of her having it on one side when they rubbed her back.
That being said, reflex came back at some point.