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In Ontario, booster seats are required for children under the age of eight, weighing more than 18 kg but less than 36 kg (40-80 lbs) and who stand less than 145 cm (4 feet 9 inches) tall. In BC, this law is in effect from when a child is 18 kg (40 lbs) to age nine or 145 cm tall (4’9″), whichever comes first.
