It was a sight that jarred motorists on a busy Florida freeway in the US.

Traffic came to a standstill and a woman sprang from her car, holding a baby, screaming for help.

Pamela Rauseo, 37, got that help for her five-month-old nephew Sebastian de la Cruz, who was turning blue.

Lucila Godoy, 34, left her three-year-old son in her car to help Ms Rauseo perform CPR on the unconscious infant, who she said was born prematurely and had respiratory issues. Miami Herald photographer Al Diaz, who was stopped right behind Ms Rauseo, jumped out of his car.

"I heard screaming," he said yesterday.

He saw a woman get out of the car in front of him "screaming that the baby can't breathe".

Diaz ran through traffic to get more help and found policeman Amauris Bastidas, who ran to the scene and took over CPR for Ms Godoy, performing chest pumps while Ms Rauseo breathed into the baby's mouth.

"He started breathing and crying," Officer Bastidas said. "Then he started not breathing again."

They frantically started CPR again and got the baby breathing. By that time, more help had arrived.

Miami-Dade Fire paramedic lieutenant Alvaro Tonanez helps rescue Sebastian de la Cruz. Picture: Al Diaz/Miami Herald

Capt. Anthony Trim and Lt Alvaro Tonanez of the Miami-Dade Fire Rescue service - also stuck in traffic - heard the emergency call over the radio, jumped out of their separate cars and took over giving CPR.

The baby was last night in a stable condition in hospital.

Rescuers assist Pamela Rauseo, centre, who performed CPR on her nephew. Picture: Al Diaz/Miami Herald
Pamela Rauseo tries to revive her nephew. Picture: Al Diaz/Miami Herald

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