When the brain does not know that the legs can walk? This is what his mom said.

Zuhayr thought he could not walk till he was 5 years old and thats when we met.  About 25 sessions of 4channel-neurofeedback +  ISF-neurofeedback, he was trying again.  (please note - no 2 brains are the same and 25 sessions is not the norm).

https://neurofeedback-asia.com/down-syndrome/

https://www.mayoclinic.org/diseases-conditions/cerebral-palsy/symptoms-causes/syc-20353999

https://www.cdc.gov/ncbddd/birthdefects/downsyndrome.html