What is this baby bird?

I found a baby bird, almost featherless, and I am not sure if its a house sparrow, or a other sparrow, or maybe a finch.... Anyways, its health is fine, it wont shut up while we feed it! It eats healthy, every hour now, has lots of feathers (if it were wild around now, it would be fledging) and is very active, starting to show interest in the branches in its cage. But could someone please tell me what the little monster is? Im practically tearing my hair out over what he/she (Hope) is! I have a pic on photobucket, search for 'Hope the baby bird' the pics kind of fuzzy, and its bad quality. Hope is turned <- way. Little brown bird. Thank you very much in advance :). Hope is getting hungry, so I gotta stop there. But we raised her from when her eyes were closed, and we can't seem to find a wildlife rehibilitator. We are still on the lookout, but everyone has fallen in love with this sweet little thriving bird.