The newborn was just hours old, found with his umbilical cord still attached. A mom and daughter were walking by when they heard his screams and found him in a canvas shopping bag, fire officials said. They then rushed the baby to a nearby firehouse.
WATCH: "Come to us."
At the firehouse, paramedics saved the infant's life, performing CPR and reviving the boy.
"The baby was cold as concrete," said CFD Paramedic Field Chief Patrick Fitzmaurice. "I wasn't too optimistic, but like I said to the lieutenant, I wasn't ready to lose this one today, and neither were they and they worked very hard."
They used heating pads and warming blankets immediately, and took him to Norwegian American Hospital in an ambulance with a police escort, officials said. The newborn's condition was stabilized and he was crying and kicking. He was transferred to Lurie Children's Hospital for further treatment.
Police have not yet released details on who left the child or why, but want everyone to know there were other options.
Illinois is a state with a Safe Haven Law, meaning anyone can hand over a baby 30 days old or younger that is unharmed to staff at a hospital, police station, or fire department with no questions asked.
"But come to us, man. If she had called 911 we could have taken the baby to one hospital and her to another," said Fitzmaurice. "We don't judge. Take him to a firehouse. Leave the baby there. Give the kid a chance."
Chicago Police Area North detectives are investigating.