Thanks so much for everyone's suggestions. I'm sad to say that he passed away a few minutes ago
He was doing very well, eating, pooping, I thought he might get strong enough for me to put him back near the nest but he suddenly stopped breathing and moving. I know that the mother may have kicked him out of the nest for a reason but it's still sad that he didn't make it. I didn't think that he would being so young but I had to at least try.
Again, thanks everyone...