A boy, 3, understood to be playing with his twin brother at units at Thorneside, has died after being accidentally struck by a reversing vehicle.
The driver of the car was a learner driver.
Police said he was 16 and was taken to hospital where he was treated for shock.
Police said they received a call about an incident at 3.35pm on Saturday.
Officers and paramedics went to a unit complex on Thorneside Road.
Police said the three-year-old was pronounced dead at the scene.
The second boy was taken to hospital with relatively minor injuries.
Investigations continue into the incident at the bayside suburb.