Nine people were injured Saturday when a fire ripped through a Bronx building, authorities said.

The blaze sparked inside a second-floor apartment on University Ave. at Eames Place in Fordham Manor at 5:07 p.m., the FDNY said.

Flames raged out of the flat’s windows as neighbors scrambled down the fire escape to safety.

Tyrone Lee, 32, said he saw a pregnant woman with a child running out of the apartment where the fire started.

“She was hysterical. They were in the lobby crying and screaming,” he said, adding that they didn’t appear to be hurt.

Lee and several other neighbors tried to douse the flames but the smoke was too heavy.

“We kicked the door open. We had a fire extinguisher. But black smoke poured out.”

Firefighters extinguished the blaze by 5:50 p.m., authorities said.

Neighbors told the Daily News that an infant boy turned blue from smoke inhalation was rushed to the hospital.

Another person was also taken to the hospital for further treatment, authorities said.

Five other people and two firefighters were treated at the scene for non-life threatening injuries, the FDNY said.

The cause of the fire is under investigation.