A two-year-old boy has been killed after the car he was travelling in was involved in a collision with a truck near Raymond Terrace.

Emergency services were called to Clarence Town at around 9:25am this morning.

A Holden Commodore station wagon and a rigid truck had been involved in a crash, resulting in the truck carrying boxes and equipment rolling onto its side.

The driver of the car, a 22-year-old woman was taken to John Hunter Hospital in a serious but stable condition.

A two-year-old boy and 14-week-old baby were also taken to hospital but the boy died enroute.

The baby is being treated for minor injuries in hospital.