Four children, including two infants, were injured when their Brooklyn apartment went up in smoke early Sunday morning, officials said.

The young kids — a 14-year old boy, 8-year-old girl, 14-month-old girl, and 5-month-old baby — were recovering after the blaze at the Wyckoff Gardens apartment building in Boerum Hill at around 1:30 a.m. Sunday.

“I heard the kids crying and screaming,” said neighbor Luciano Laboy.

“I looked out the window and saw the hallway was covered in smoke.”

Rescuers placed oxygen masks on the children and carried them out of the building.

The 8-year-old girl was listed in critical condition at Cornell Medical Center Sunday and the 5-month-old baby was also there listed in stable condition.

The 14-month-old infant and 14-year-old boy were both in stable condition at Methodist Hospital, officials said.

One 63-year-old female was treated at Methodist for minor injuries, authorities said.

It’s not immediately clear what caused the fire in the 21-story building.