A three-year-old girl was blinded when she was knocked over by a hit-and-run biker as she crossed the road with her mum.
Three off-road bikes suddenly appeared and sped towards Jessica Pollard and daughter Olivia at high speed, sending the little girl flying as a mudguard hit her.
One biker glanced round, but none stopped. Olivia, who was airlifted to hospital, was left blind in both eyes and with a fractured skull and severe cuts.
Jessica, 20, said: "Please help find the scumbags who have done this to my little girl. It is disgusting. They have no decency."
Jessica and her only daughter had got off a bus on Wednesday in Herringthorpe, Rotherham, South Yorkshire, after shopping,
She said: "We had a lovely afternoon together and were on our way home.
"We got to the white lines in the middle of the road when I heard the bikes coming and saw three of them racing towards us.
"I tried to grab for her but it was too late. She went up on to the mudguard of the first bike and was thrown into the road.
"The rider didn't even slow down. The man on the second bike looked behind him but all three rode off."
Passers-by and neighbours alerted the emergency services and Olivia was taken to Sheffield Chidlren's Hospital.
Jessica added: "At the moment she can't see as there is a lot of swelling and doctors think a fragment of bone may be causing problems with her sight.
"All we can do is wait to see. I don't think she will be coming home anytime soon."
Jessica said young bikers often ride around the estate in Herringthorpe at high speeds.
She said: "I hope the people who did this to my Olivia have the decency to come forward.
"They left my innocent child for dead in the road. What kind of a person does that?"
She added: "If anyone has any information please contact the police before someone gets killed. Don't protect them, they don't deserve it."
Inspector Geoff Young, from South Yorkshire Police added: "This is a very serious incident. "If anybody knows who they are, let us know."