The mother of the child was picking up a food order for a delivery service when the car was stolen, Police Superintendent Tim Bernhardt told FOX29 Philadelphia.
The suspect drove the vehicle a short distance before pulling over and taking the infant girl out of the car and leaving her on a sidewalk still in her car seat, Bernhardt said.
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Police in Upper Darby, Pennsylvania, said a suspect stole a car with an infant still inside Wednesday night. The baby was found safe in her carseat on a sidewalk a short distance from where the theft happened. (FOX29 Philadelphia / Upper Darby Police Department.)
The child was unharmed in the incident, police said. The girl is reportedly 11 months old, according to WPVI-TV.
Meanwhile, police were working to locate both the suspect and the stolen vehicle.
Police in Upper Darby, Pennsylvania, are seeking the car theft suspect and the stolen vehicle.
Police released a photo of the suspect, who appeared to be wearing a black New Balance brand hooded sweatshirt and red shoes.
Authorities asked the public to call 911 if the suspect is spotted.