Officers were called to a south-end location early Monday evening after some people noticed a child as young as two who had been left in the vehicle.
The car hadn't been running for about half an hour and the temperature at the time was -17 C.
Paramedics removed the youngster, who was cold but appeared to be fine.
A woman believed to be the mother has been charged under Alberta's Child, Youth and Family Act with causing a child to be in need of intervention.
She was allowed to leave the scene with the toddler.
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