The CareFlight rescue helicopter was dispatched to Northmead at 10.08am after the incident, involving a three-year-old girl and her mother.
It’s understood the mum and bub were waiting to cross the busy Windsor Road when the pram was hit and flung forward about 15 metres.
Miraculously, a firefighter and an intensive care doctor witnessed the accident and rushed to provide initial care to the child.
A CareFlight spokesperson said the girl was unconscious for a period of time.
“Landing on a grass field next to the road, CareFlight’s specialist doctor and critical care paramedic continued treatment,” the spokesperson said.
CareFlight’s medical team continued observation as the girl was rushed by ambulance to The Children’s Hospital at Westmead, where she remains in a stable condition.
CareFlight’s specialist doctor Fay Balian praised the quick-thinking of the two bystanders.
“The people who were treating the patient prior to us arriving were really great and helped to maintain her condition,” Dr Balian said.
Police, fire and rescue and ambulance crews also attended the scene.
It’s believed the woman was not at a pedestrian crossing point when the incident occurred.