A baby being taken from Preston to Leeds was injured when an ambulance skidded on ice and overturned on a motorway.
The four week old baby boy was being taken to hospital from Preston to Leeds when the ambulance crashed on the M62 at the junction with the M621 at Gildersome on Sunday.
Police say the boy's parents were travelling separately and were today at the boy's bedside.
The baby was taken in another ambulance to Leeds General Infirmary. He is in a critical condition .
A spokesman for Leeds Teaching Hospitals Trust said the baby boy was being taken to Leeds General Infirmary for specialist treatment for a pre-existing condition.
Two ambulance staff from Yorkshire Ambulance Service had travelled with the nurse and doctor to Preston to collect the child before setting off to return to West Yorkshire.
Police said the incident took place after a number minor accidents on the slip road prior to the ambulance overturning at 8.43am.
The female driver of a Toyota Corolla was involved in an accident with a VW Passat and moments later a Nissan Micra crashed into the central barrier.
While police were travelling to the scene, near Junction 27, the ambulance skidded and overturned at the same location.
The incident took place below the fly-over at Gildersome spur.
The ambulance lay on its side at one side of the bridge as police accident investigators carried out their inquires.
Skidmarks stretched about 50m along the carriageway where the ambulance appears to have travelled on its side
A spokesman added: "It is believed ice on the roadway was a primary contributory factor."
The ambulance crew were said to be shocked by the accident but otherwise unhurt. No-one else was injured.