A four-year-old girl was found dead in a Queens shelter Thursday afternoon, sources said.

The child’s mother said she put the tot down for a nap and when she checked on her a few hours later, the child was unconscious.

EMS responded to a 9-11 call around 12:50 p.m. to the Briarwood Family Residence on 134th Street and pronounced the tiny victim dead at the scene.

Police are investigating and they are waiting for the Office of the Chief Medical Examiner to determine a cause of death.

The city’s Department of Homeless Services is also investigating.