A mother yesterday urged youngsters to wear cycle helmets after her son suffered a fractured skull.
Four-year-old Cameron Garbutt was not wearing his helmet when he rode his bike in front of a Honda Civic car at Friday lunchtime outside his house in The Oval, West Cornforth, near Durham.
He also suffered a broken left leg.
Last night his mother, Catherine Reid, 23, said Cameron had been out playing with his twin brother Lennon when he rode in front of the car.
The impact pushed him against a parked car.
"The doctors hope he may be well enough to come home by the end of the week, but he needs a skin graft operation and it depends on how that goes.
"He has been up every hour being sick. I have been at the Treetops children's ward with him at Durham University Hospital all weekend." Ms Reid, who spent all weekend at the hospital, said both Cameron and Lennon had cycle helmets. "I tell them to wear them but boys will be boys. I was looking after their sister Bethany, who is 19 months old, when neighbours told me what had happened.
"Neither of them will be allowed on their bikes without their helmets, but other children were out on their bikes today without helmets, despite what happened to Cameron."
Ms Reid said: "I am really grateful to neighbours Dave Fairless and a girl called Sabrina who saw the accident and brought Cameron into the house. He was unconscious and they helped revive him. I went with him to hospital in the ambulance."
Inspector John Snowball of Durham Police also warned parents to ensure that their children wore protective cycle helmets following Cameron's accident. He said the Honda driver, who was said to be "badly shocked" had not been to blame.