The attack happened at a hotel in Long Island City.
Four children were injured, including the 4-year-old. Also in critical condition are a 42-year-old man and two women, ages 41 and 33.
Additionally, two 2-year-old girls, a 6-year-old girl, a 22-year-old woman and a 61-year-old women are all in stable condition.
Two firefighters suffered minor injuries.
FDNY Fire Marshals ruled the fire to be accidental, caused by a lithium ion battery from an electric scooter stored in the living room.
There were no working smoke alarms in the fire apartment.
SOUNDVIEW, Bronx (WABC) Twelve people were hurt, including several children, when a fire tore through a building in the Bronx late Tuesday morning.
Four of the victims were critically injured, including a 4-year-old boy, in the blaze on Watson Avenue in the Soundview section.
The FDNY responded just before 11 a.m. to the fire on the fourth floor the seven-story building.
It took about a half hour to get the flames under control, and firefighters rescued about a dozen people. There was heavy smoke and fire coming out several windows, with several occupants calling for help from the inside, an FDNY spokesperson said. Members made a push and removed people from both the exterior and the interior, with both the tower ladder and through the inside, removed several occupants from the fire apartment and the adjoining apartments. They were removed and handed off to EMS for treatment.
The incident happened on 37th Ave and Main Street in Flushing.
FDNY say the fire began in a hair salon just before midnight.
It then started to spread to an adjacent three-story building.
Over 200 crew members were on scene of the seven-alarm fire that took seven-plus hours to put out.
Seven firefighters were taken to an area hospital with injuries, but they are considered non-critical.
Fire marshals will investigate the cause of the fire.