I need help with Identification please!

by Ashleigh
(Bangor, Maine, USA)

Hello everyone! I found a baby bird about a week ago and it was bald in a lot of patches and had some pin feathers on its wings and other partial areas. Now it just recently shed its pin feather casings but it's still partially bald in some places. He has grown more feathers though. He/she was a lot more bald. I don't know if there's something wrong with it, but he is still bald in a couple spots. Anyway, I found him next to a fledgling (brother/sister) but the fledgling was a LOT stronger and appeared to be older. He was ready to leave the nest however this little guy was the runt or was/is sick because he was out of the nest but he couldn't move around or anything and when he ate he was still tipping his head completely back like he should still be fed from the mother. Anyway I'd like to know a few things. I'd like to know what kind of bird he/she is, if you can tell if it's male/female and if it looks like it may be sick or maybe cuz he was the runt he was malnutritioned for so long that he just didn't grow feathers in correctly. It's very alert, and healthy now. He's hopping around and trying to learn to fly. It's doing all that it should. When I first got it he slept all the time. He never moved around really.. I thought he wasn't going to make it. He was breathing kind of heavy too. Now he's doing excellent, he's just missing some feathers. Please tell me anything you can. Thanks so much for the help, it's greatly appreciated. Also, I live in Central Maine if that makes any difference or matters some. - Also he doesn't appear to have any mites or lice on him at all.