The body was in a soft, red lunch cooler on a conveyor belt when an employee of the Resource Management Companies plant in Chicago Ridge discovered it during a sorting operation at about 4 a.m. CDT, the Chicago Tribune reported.
The worker said the cooler seemed heavy so he opened it and found the newborn boy's body, with his umbilical cord attached, and a blue towel, the report said.
Chicago Ridge Deputy Police Chief Paul Landry said police were asking the public for assistance in identifying the newborn.
"We don't even know if a crime was committed at this point," said.
The Cook County medical examiner's office is to conduct an autopsy on the newborn's body Thursday, the Tribune said.
NBC reportedly holds celebs hostage to Jimmy Fallon's show
Millions of Getty images now available for free via embed tool