A man walks past debris from a fatal accident that claimed the lives of two expectant parents on their way to the hospital early, Sunday, March 3, 2013, in the Brooklyn borough of New York. A driver struck the car the couple were riding in early Sunday morning, killing both parents while their baby, who�was born prematurely, survived�and is�in critical condition. (AP Photo/John Minchillo)
NEW YORK (CBS) -- A newborn baby boy who was delivered by emergency cesarean section after his parents were killed in a horrific hit-and-run crash in New York City has died, reports CBS station WCBS-TV.
The baby's death was confirmed by community leader Isaac Abraham.
The boy, who only weighed four pounds, died early Monday morning as police continue to search for the driver of a BMW and a passenger who fled the scene of the crash.
Nachman and Raizy Glauber, both 21, were looking forward to welcoming their first child into their tight-knit Orthodox community.
On Saturday, Raizy Glauber, who was 7 months pregnant, decided to go to the hospital because she wasn't feeling well, relatives said.
"She was premature - couldn't feel the baby," said Raizy Glauber's aunt, Ruchel Bochnel. "They wanted to check it out."
The Glaubers called a car service to take them because they didn't own a car.
As the couple headed to a hospital, a BMW smashed into their livery cab in the Williamsburg section of Brooklyn.
Abraham said the livery cab's engine ended up in the backseat where Raizy Glauber was sitting before she was ejected.
"The woman was thrown out of the car," he said. "On impact, the husband was killed immediately."
Police said the expectant mother landed under a tractor-trailer. Witnesses said Nathan Glauber was pinned in the car and emergency workers had to cut off the roof to get him out.
There was a stop sign at the scene, though police said it's unclear who had the right of way. Police said the driver of the BMW fled the scene and a search is under way.
The Glaubers were both pronounced dead at the hospital. According to the New York City Medical Examiner's Office, they both died of blunt-force trauma.
Their son was delivered by emergency cesarean section, but had been in critical condition.
The driver of the livery cab, Pedro Nuniz, suffered only minor injuries.
As the Glauber's tight-knit community grieves together, they are begging the driver to come forward.
"Give yourself up, make the pain a little easier so that at least we'll know that you're not a coward facing charges," said Abraham. "You're already a coward for running."
© 2013 CBS Interactive Inc. All Rights Reserved.