It was unclear who contacted police, but the caller said the woman "was unable to move to unlock the apartment door due to her body's position and the amount of pain she was experiencing. Therefore, officers were faced with a split-second decision and forced entry into the apartment," the statement said.
Inside, they found the woman kneeling against her bed and the newborn baby boy on his back on the floor between her legs.
"Officers quickly removed the baby from the floor and wrapped him in clean towels and began tending to both the mother and her baby," police said. The baby's father had been stranded on the side of the road but was soon able to get a ride to the apartment.
The woman and child were taken by ambulance to Hackensack University Medical Center, where they were in good condition later on Tuesday, police said.