I firmly believe that one should not interfere with nature...
This summer I've witnessed two baby Red Breasted Robbins out of their nests early. Too early for flight, and too early to fend for themselves. All I can do is photograph, and not interfere. Always the right thing to do. Unless the domestic cat interferes, then it is appropriate to step in. Domestic cats are not wild. I'll check on this little one tomorrow evening after work.
Update: I couldn't find it.
Update two: Found it. This morning it was in the same place on the lawn, and Momma bird was feeding it. She would feed a little, then fly back up into the tree. I'm hoping this little one will learn to fly soon.