A woman is believed to have saved her seven-month-old grandson from being killed or seriously injured when a quad bike hit her while she was pushing his pram.

The 51-year-old is thought to have pushed the pram out of the way as bike hit her at a bus stop on Ferrand Road, Bierley, Bradford.

The woman is currently in Leeds General Infirmary being treated for her injuries, which include one arm broken in 27 places. The baby was left with minor injuries and bruising but kept in hospital overnight.

The rider of the quad bike, a 28-year-old man, was taken to Leeds General Infirmary with a serious head injury. He remains in hospital, but police said his injury was not believed to be life threatening.

Police are now appealing for witnesses to the incident, which happened on Thursday at 2.35pm, and are keen to speak to a second quad bike rider who may have travelling with the one involved in the crash.

The baby’s mother, the injured woman’s daughter, said police believe she had pushed the baby’s pram out of harm’s way just before the quad hit her.

The woman, who lives nearby but who family members did not wish to be named, remains in hospital being treated for broken ribs, a fractured pelvis, bruised lung and broken collar bone.

Her arm is due to be fixed with metal plates and pins later today, and doctors have told her that she may never regain full use of it.

The grandmother and grandson had been waiting for a bus when the bike, which police say was “road legal,” hit them.

The baby’s mother said: “She pushed him out of the way, so luckily he has a few bruises but that’s it.”

She said the police had told her that her mother had “heroically” pushed the pram out of harm’s way in time.

PC Andrew Richardson, of Western Area Roads Policing Unit, said: “I would urge anyone who witnessed this collision to call the Western Area Roads Policing Unit on 101. From those who we have spoken to already there is suggestion that there may have been another quad bike travelling with the quad bike involved in this collision. If this is the case I would urge that rider to come forward as a witness.”