Heartbreaking new details have emerged about the horror car park accident in Sydney’s southwest which claimed the life of a baby girl, with reports suggesting the driver was her mother.

The five-month-old was killed when a white Renault SUV reversed over her pram in the busy Minto Mall car park on Brookfield Road about 3.30pm on Monday.

Her brother, who was also struck, has since been discharged from hospital.

Police confirmed the 35-year-old female driver was known to the children - with the Daily Mail reporting on Thursday it was the children's mother behind the wheel when the tragic accident unfolded.

Witnesses reported seeing the woman moments later in a flood of tears outside a nearby El Jannah restaurant.

Investigators are now examining whether she mistakenly reversed instead of

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