A 3-year-old boy tumbled from a second-story window in Brighton Beach on Sunday and is in critical condition, according to authorities.

The incident occurred around 1:12 p.m. at 89 West End Avenue in Brooklyn, the NYPD said.

The child was rushed to Staten Island University Hospital in critical condition.

No criminality is suspected in the fall, police said, though details surrounding it were not immediately available.

The investigation is ongoing, cops said.