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.
Sign up for our newsletter to stay up to date.