A 4-year-old Bronx boy died yesterday after he fell out of a fourth-story window, authorities said.

Witnesses saw Gabriel Estevez briefly hanging out of the window at 3:45 p.m. at the Morissania Houses on East 161st Street.

“We heard a little kid screaming. We looked and he’s hanging out the window,” said witness Frank White. Police could not say if there was criminality.