We had a sparrow fall out of the tree several years ago. We nurtured that naked baby until it grew feathers and was hopping back and forth in a cage....it died though before we could release it to the wild. It was fun to watch it grow feathers and even learn to fly on it’s own in the cage...
We never had one that young but a couple of wounded birds recuperated on our big screened-in porch till they could fly again.
Experiencing things like that in childhood taught us to believe in miracles.