How many times can a bird fall from its nest and live?

There is a bird’s nest in the top corner of our metal car covering. There are babies in the nest, already hatched, but one has fallen out. I used a piece of cardboard to shimmy the baby back into the nest so that I wouldn’t touch it, but the next day it was out again. So I repeated. This birdie has fallen three times. The nest is above concrete, and up about six feet. Is this little birdie going to meet its maker, or will it live to see another day?

I think it might be very close to being a fledgling, as it had a few feathers, but there were still fuzzy parts on its belly.
I saw said birdie fall the last time, and there was a soft plop. I mean….it’s six feet up and he/she (idk) hit concrete, so…
Joooooooooooooooooooon…..I don’t know if the bird has pre-existing heart conditions or not, but I’m pretty sure that me being hetero will not effect its fal.
Carol, I hope you’re talking about Jooo, because the fact that I even took the time to ask this question should let you know I care.