An eight-year-old boy was hit by a suspected drink-driver in a pub car park.
Bystanders rushed to the youngster’s aid after he was knocked down outside the King’s Horse in Stafford just before 18:00 GMT on Tuesday.
When paramedics arrived they found he had suffered potentially life-changing injuries and took him to hospital.
A 32-year-old woman was arrested “on suspicion of a positive breath test”, Staffordshire Police said.
Someone can only be arrested on suspicion of the offence if they are in control of a vehicle, the force said.
The woman, from Stafford, remains in police custody and the boy is in a stable condition police added.