keep feedind him, or her, keep him warm and provide plenty of water, if he s not eating on his own u can mix baby formula with milk and some oats and that will do wonders, if he is eating on his own already, and u dont want to keep him, do not touch him, so he wont be human attached, and u might be able to rehoming to a park with some of his friends, lol, if not call ur local aspca, and get the number of some wild bird rehabbers or any bird rehabbers and they will help u, if they have their hearts in the right place, thank u for taking care of the baby, theyr also God s creation