A Queens woman accused of throwing her 3-week-old son out of a fourth-floor apartment window has been charged with murder, police said Saturday.

Rashida Chowdhury, 21, is facing two counts of second-degree murder, Queens District Attorney Richard A. Brown said.

The infant, Rizwan Ahmad, was found dead in the courtyard of the building at 85-55 115th St. in Richmond Hill about 4 a.m. Friday, police said. He died of blunt impact injuries to his head and torso, police said.

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Mazol Ilyayeva, a resident of the building who saw the baby in the courtyard, said Saturday that she's struggling to understand what transpired before Rizwan's death.

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"I want to know what happened," she said. "I don't understand how a 21-year-old mother can turn against her own child and throw him out a window as if he were trash."

It was not immediately clear whether Chowdhury had an attorney. She was awaiting arraignment Saturday night in Queens Criminal Court.