A baby girl has died and a young child has been seriously injured in a crash in Sydney's south-west.

Emergency crews were called to the car park at Minto Mall about 3:30pm on Monday afternoon, where the pair had been struck by a car.

The five-month-old infant was given CPR but died at the scene.

The five-year-old child has been taken to The Children's Hospital at Westmead in a serious but stable condition.

NSW Ambulance said seven ambulance resources had been called to assist, including a doctor and a critical care paramedic who were flown to the scene.

The driver of the car, a 35-year-old woman, was not hurt.

Police said she is known to the children.

A crime scene has been set up, and an investigation into the crash is underway.

Debbie, who was in the area at the time, said the ba

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