The youngster was riding the quad bike near Holsworthy when it overturned and she was airlifted to hospital.
A four-year-old girl from Holsworthy was injured when the mini quad bike she was riding overturned.
The girl was with family members who were walking alongside her at around 5.30pm on Sunday (September 27).
They were on the public footway, which leads from Bodmin Street over the River Deer, heading in the Bude direction, when the quad bike collided with the verge and wall of the viaduct bridge and overturned onto the four-year-old child.
The girl was taken to Bristol Children’s Hospital by air ambulance with head injuries which were at first believed to be serious, but were later described as minor.
The footpath was closed for two hours while a forensic examination was carried out.
Officers from the Serious Collisions Investigation Unit are appealing for any witnesses to come forward, in particular anyone who may have seen the red quad bike in the area before the collision.
Anyone with information is asked to call the Serious Collisions Investigation Unit via 101 or email email@example.com, quoting reference 680 of 27 September.
Information can also be passed to Crimestoppers, anonymously, on 0800 555111, or via crimestoppers-uk.org.