A toddler has been rushed to Westmead Hospital after falling up to five metres from the second-floor window of a unit block in Campsie.
Paramedics were called to the scene about 4pm after the 18-month-old girl pushed a flyscreen from a window and fell onto a concrete driveway.
She suffered no external injuries and was taken to hospital in a stable condition.
It comes two weeks after a three-year-old boy fell seven metres from an apartment window at The Entrance, on the NSW central coast.
He also landed on concrete, suffering critical head injuries, and was airlifted to hospital by CareFlight.
A paramedic, David Morris, said with the arrival of warmer weather, parents needed to be particularly conscious of window safety.
''It's a timely reminder for parents to make sure that their windows are secure when young children are around,'' he said.
CareFlight doctors last month warned that a child falls from a window or balcony every week in Australia, and reminded parents to ensure windows were never left open more than 10cm, to move furniture away from windows and be aware that flyscreens can give way.