The crash occurred at the corner of Prescott Street and Hardenburgh Avenue around 9 a.m. May 26.
A medical chopper was summoned at first.
That was canceled, however, and Cresskill Fire Department EMS members took the boy to Hackensack University Medical Center.
Police Chief Anthony Dimitriadis said the minor was in serious but stable condition. His department's Traffic Unit was investigating, he said.
The chief corrected a mistaken report that was being shared of the youngster being thrown 20 feet. That didn't happen, he said.
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