Yayo, 29, whose real name is Marvin Bernard, was charged in March for allegedly hitting the boy, James Rosemond. The alleged victim is the son of Jimmy "Henchman" Rosemond, recording executive and manager of rapper The Game.
Yayo has pleaded not guilty to the charges and is free on $5,000 (EUR3,600) bail.
Scott Leemon, Yayo's lawyer, said, "The prosecution's nine-month offer is one Tony vehemently rejected. It's not even a good offer for a guilty person, and Tony denies the allegations absolutely."
A misdemeanor complaint said the youth told police Yayo hit him with his hand, "causing (his) face to strike the door of a building" and causing him "to have a headache, an earache, and caused substantial pain to (his) face."
Yayo was charged with with assault, harassment and endangering the welfare of a child.
The case was adjourned until Sept. 6, when Manhattan Criminal Court Judge Neil Ross is expected to rule on Leemon's motion to subpoena e-mails between 5W Public Relations and its client, Czar Entertainment.
Leemon refused to say why he wants to see the e-mails.
Czar Entertainment was co-founded by Rosemond. Its recording artists include Brandy, The Game and Mario Winans, according to the company's Web site.
Besides Yayo, G-Unit includes rappers 50 Cent, Lloyd Banks and Young Buck.