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When can a child stop using a booster seat?

There's no single age cutoff. Canadian guidance says keep a child in a booster seat until an adult seat belt fits them properly on its own, usually when they are about 145 cm (4'9") tall, roughly 36 kg (80 lb), and typically somewhere between 9 and 12 years old.

Provincial laws vary in their minimum age, height or weight for leaving a booster, so it's worth checking your specific province's rules as well as the fit test.

Strength of evidence

Strong

This is based on consistent national guidelines from the Canadian Paediatric Society and Transport Canada, both of whom base recommendations on crash-test data and biomechanics rather than a single trial.

What the evidence says

There isn't one magic birthday when a child should stop using a booster seat. What matters most is whether the car's own seat belt fits them properly without any booster at all.

The Canadian Paediatric Society says to keep your child in a booster seat until they can safely wear the adult seat belt. For most kids, that happens somewhere between 9 and 12 years old, and usually once they are around 145 cm (4 feet 9 inches) tall.

To check if your child is ready, sit them in the back seat without a booster and look at three things. Can they sit all the way back with their knees bending comfortably at the edge of the seat? Does the lap belt sit low across their hips, not their belly? Does the shoulder belt cross the middle of their chest and shoulder, not their neck or face? If any of these don't work, or if your child slouches or wiggles out of position on a real trip, they still need the booster.

Height and sitting ability matter more than age alone, because kids grow at different rates. Some children are ready before age 9, others need the booster a bit past 12. Provinces also set their own minimum legal age, height or weight for leaving a booster, so it's worth confirming your province's specific rule too.

Until age 13, kids are safest riding in the back seat regardless of whether they still use a booster, since that keeps them away from front airbags.

Sources

✓Reviewed by CH, MD, FRCPC

Reviewed by a specialist physician certified by the Royal College of Physicians and Surgeons of Canada, who has read this answer against the sources listed above and confirmed it reflects them. That is not medical advice about your child. How we review

Answer checked August 3, 2026

Educational information only. Not medical advice, not a diagnosis, and no doctor-patient relationship is created by using this. Founded Parent has not examined your child and does not know their history, so this may not apply to you. In an emergency, call your local emergency number. What Founded Parent cannot do

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