It just sucks. I have both a 6 year old and a 10 year old with DMD. We recently moved to a ranch house because my 10 year old could no longer go up the stairs. We are now battling insurance to get his wheelchair approved. He still can walk some, but the decline is noticeable. Just focus on what he can do and not what the other kids can do. Easier said than done. I have t remind myself all the time. My son is looking forward to his wheelchair. He calls it the tank. The kids think his scooter is cool. Make the best of everything. Make the wheelchair or scooter sound exciting even if it makes you want to cry. Make a big thing out of everything. Celebrate every accomplishment, every birthday, everything!