Walter Little-Cocca documented the incident in an emotional Facebook Live video around 4:05 p.m., still inside of El Patron restaurant on JFK Boulevard. The video had 410,000 views as of Thursday evening.
"I'm at my neighborhood restaurant with my special friend and a lady comes in and hands her a baby, apparently a newborn, and runs out," he said. "You probably won't believe this. This is crazy."
The teen walked up the counter and said she'd found the baby, before Cocca's girlfriend, Alease Scott, offered to check the baby's vitals, ABC7 reports.
That's when the girl handed the child over and then left the restaurant, the outlet says.
Cocca was quickly moved to tears in the video, which captured EMS workers giving the baby oxygen, and her crying.
Authorities apparently later found the teen, who was doing well. The baby is expected to be placed up for adoption.
Click here to follow Daily Voice Teaneck and receive free news updates.