Noah Zunde was just 22 months old when he was left in the back seat of his family car outside a childcare centre in Kyneton, Victoria for seven hours on February 19, 2015.
Noah’s mother inadvertently believed she had dropped her son off at daycare, and only discovered his body when she realised he was not in the centre.
The 22-month-old was still strapped into his car seat when his mother found him. Paramedics attempted CPR for several minutes, but he could not be revived.
Now, his death is set to be at the centre of an inquiry by the Victorian coroner into the deaths of children who were unintentionally left in cars.
Noah's case is the first of two that Judge Sara Hunchey will examine, in an inquest which will begin on Wednesday.
The purpose of the inquest is to explore the physiological and cognitive role involved in someone leaving their child in a car, in an attempt to prevent similar tragedies from occurring.
Monash University associate professor in psychology Matthew Mundy is set to give evidence during the investigation into Noah's death, and believes the toddler's mother was "severely sleep deprived" at the time of the accident.
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Dr Mundy said evidence suggested her lack of sleep may have contributed to a memory failure that is sometimes called 'forgotten baby syndrome'.