J.,
I just read your post. Your son sounds a lot like mine: ECI, low tone, they way his ankles fall, etc. Although my son learned to walk a little before age 2 by getting braces. Here is what we have been through:
He went to a pediatric orthopedic doctor and got AFO braces. They went from just below his knee to past his toes. You are right they were expensive and insurance will pay some. Even though they cast their feet and make a mold they can still adjust the braces as your son grows (adjustments were free.) Once he was use to the braces he took off! It was a whole new world. He still had ECI help.
I have not heard anything about the Fast Fit. I would ask your ped. about that.
After he turned 3 he went into SMOs. These are still braces that have to be cast to the feet but they go just above the ankle. Wow, we were shocked that he could not walk in them...his muscles were so weak. It took a few weeks and again he was off and happy. He walked like a drunk for awhile.
He is now 5 and still wearing the SMOs. His right foot has improved. His left foot has not, the ankle still falls to the ground. He can walk, run, jump with and without braces but he gets tired and starts to limp when he is not wearing them.
So have braces helped him? Yes they have but not like we thought. We were told his ankle would correct itself by age 3. It hasn't.
There is Shiner's Hospital in Dallas that you can look into. You will need a referral: http://www.shrinershq.org/Hospitals/Main/ This is were my son will be sent depending on what the specialist says next month.
Feel free to email me if you have any questions,
Michelle