Neighbors discovered the 5-month-old girl crying on the floor of a hallway in a building in Coney Island.
The baby was taken to Coney Island Hospital and was found to be in good condition.
Neighbors tell NY1 that her parents had been fighting on another floor of the building.
The girl's mother is being interviewed by police.
The baby is being looked after by the Administration for Children's Services.
By: NY1 News