aggressive behavior

by Claudia
(Coweta, OK)

I have a young parotlette - (hatched in November 2010) since February. He's been smart and fun (mimics whistled tunes, says a few phrases, etc). He's begun aggressively biting us when we let him out now. I don't know how to calm him. I used to just talk quietly to him and give him attention, but now he bites my face or hands. So very frustrating. Any help would be so appreciated.