A young Queens mom told cops she hurled her infant son out of a fourth-story window of her apartment because she thought he was possessed, sources said.

Rashida Chowdhury, 21, was charged Saturday with second-degree murder and intentional murder of a victim less than 11 years old, according to police.

Chowdhury allegedly tossed her 19-day-old son, Rizwan Ahmad, out of a window and into the courtyard of 85-55 115th Street in Richmond Hill early Friday.

At first, Chowdhury told detectives that her baby boy “flew out the window” after a demon entered his body.

“She gave some bulls–t story,” a source close to the investigation explained. “[She said] the baby was possessed.”

But Chowdhury later confessed that she killed little Rizwan herself.

“She [told cops] she tipped him out the window,” the source said.

A neighbor found Rizwan’s lifeless body dressed in a white and blue onesie at around 4:10 a.m. Friday. Rizwan was pronounced dead at the scene, cops said.

He was born on July 18.

Rizwan’s father was cleared in the case after questioning, cops said.

Chowdhury has two other children around the ages of 2 and 8, said sources.