The baby was believed to be 4 to 8 hours old. Paramedics checked him out and found him alert and in good health. He was then taken to Downey Community Hospital for further evaluation and care.
"Since most abandoned babies are never found alive, this baby boy is a lucky survivor, thanks to the observant crew members who spotted him," a fire department statement said.
Under the "safe surrender" program parents or adults with legal custody can confidentially hand over a newborn within 72 hours of birth to personnel at any fire station or hospital in Los Angeles County without fear of prosecution, as long as the baby shows no signs of abuse or neglect.
City News Service contributed to this report.