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this is Canadian.
http://www.cps.ca/English/surveillance/cpsp/studies/lap-belt_syndrome.htm 25% of paraplegia among patients with lumbar spine fractures in lap-belt syndrome.
http://www.albertahealthservices.ca/4921.asp
Most of Section 65 of the Alberta traffic act is below. Note the differences in age and weight.
65(1) In this section,
(a) "child" means a child under the age of 6 years whose
weight does not exceed 18 kilograms;
(b) "motor vehicle" does not include a motor cycle or moped;
(c) "seat belt assembly" means a device or assembly that
(i) is securely fastened to a motor vehicle,
(ii) is composed of straps, webbing or similar material
and includes a pelvic restraint or an upper torso
restraint, or both,
(iii) is capable of restraining the movement of a person in
order to prevent or mitigate injury to the person, and
(iv) meets the standards prescribed under the Motor
Vehicle Safety Act (Canada).
(2) No person shall, on a highway, operate a motor vehicle
registered under the Motor Vehicle Administration Act in which a
child is a passenger unless
(a) the motor vehicle is equipped with the prescribed child
seating assembly,
(b) the child seating assembly is properly installed, and
(c) the child is occupying and is properly secured in the child
seating assembly.
(3) Where a motor vehicle is operated on a highway and it is
equipped with a seat belt assembly
(a) in the seating position that is occupied by the driver, the
driver shall wear the complete seat belt assembly, and
(b) in a seating position that is occupied by a passenger over
the age of 15 years, the passenger shall wear the complete
seat belt assembly.
(4) No person shall, on a highway, operate a motor vehicle in
which a passenger
(a) who has attained the age of 6 years but is under the age of
16 years, or
(b) who is a child weighing more than 18 kilograms
occupies a seating position for which a seat belt assembly is
provided unless that passenger is wearing the complete seat belt
assembly.
Page 12 -
http://www.albertaseatbelts.ca/files/AORP Instructors Manual FINAL June 06.pdf