It happened on the B3081 near Verwood - he had to be cut free by firefighters.
Bournemouth: Boy Critical After Car Hits Two Pedestrians
A two-year-old boy's still in a critical condition in hospital after he and a woman were hit by a car in Bournemouth.
Officers were called to Charminster Avenue at 9.03am on Thursday 8 October 2015.
A woman and a child were hit by a black Volkswagen Lupo. A red Audi A1 was also involved in the collision.
The local woman, aged in her 40s, was taken to Southampton General Hospital with serious leg injuries. A two-year-old boy was taken to Poole Hospital with potentially life-threatening injuries. He remains in a critical but stable condition.
Road closures were put in place on Charminster Avenue with the junctions of Sutton Road, Gresham Road and Charminster Road.
Police Sergeant Jon Wren, of Dorset Police’s Traffic Unit, said:
“We are currently investigating exactly what happened and I am appealing to anyone who may have witnessed the collision or the manner of driving of either vehicle prior to the incident to contact me on 101.
“Specially-trained family liaison officers from the traffic unit are supporting family members of the woman and child at this difficult time."
A 27-year-old man from Bournemouth was arrested on suspicion of a driving offence. He's been released on police bail until January.
Violent crime was up 37% in the last year. Police say it's mainly due to a change in how offences are recorded.
Anne-Marie Ellement took her own life after claiming she'd been raped by two colleagues.
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