The close call came at Humber River Hospital in Toronto's west end on Sunday.
The girl's mother went into labour while walking to the hospital, gave birth on the sidewalk and had to be rushed to Humber for treatment.
The child was declared dead, but police standing by the infant while waiting for the coroner to arrive eventually saw the baby was still moving.
Humber says its chief of emergency medicine and head of pediatrics will be reviewing all procedures applied in the case.
Humber says the baby is currently in care at SickKids hospital.
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