The fire took place in Bridgeport around 3:20 a.m., Monday, Dec. 5 at 129 Wood Ave.
According to Scott Appleby, director of Emergency Management for Bridgeport, firefighters responded to the apartment after the department received several 911 calls.
First arriving units found a fire in a second-floor apartment over a commercial building, contained to one unit, Appleby said.
Two adults and a child were transported to the hospital for smoke inhalation from the exposure, Appleby added.
Five adults and one child were displaced.
The cause of the fire is under investigation.
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