Irvington police alerted several municipalities to search for a stolen Mercedes Benz SUV from Clinton Avenue just after 8 p.m.
It was found shortly before 11 p.m. in Newark's South Ward.
When officers found the car, the 3-month-old child was in the back seat, awake and alert.
The baby was taken by EMS to the hospital for a precautionary evaluation.
"This is an example of exemplary police work where multiple agencies worked in unison with a common goal, I am proud of the work done by all the officers involved, and I am grateful for the positive result," Essex County Sheriff Armando Fontoura said.
The search for the suspect continues.
Anyone with information is asked to contact the Essex County Prosecutor's Office tips line at 1-877-TIPS-4EC or 1-877-847-7432.
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