A 1-month-old boy was found dead inside an Upper Manhattan apartment Tuesday, cops said. 

A family member called 911 to report the infant lifeless inside the apartment on West 162nd Street near Riverside Drive in Washington Heights, police said. 

Officers responded to the scene, as did EMS units – who rushed the unconscious and unresponsive child to NewYork-Presbyterian/Columbia University Irving Medical Center, where he was pronounced dead, cops said. 

The little boy’s body showed no visible signs of trauma, authorities said. 

The investigation is ongoing, police said.

The city Medical Examiner’s Office will officially determine the baby’s cause of death, cops said.