Who?s riding"

Children around eight years and up.
Once kids reach either eight years, 80 lb. (36 kg) or 4?9,? they?re deemed ready by law to move out of the booster seat in most regions. But experts say that of the three, height is the best indicator of readiness. (The guideline is nine or ten years old in some provinces, but there is no legislation in several parts of the country.)
Safest use

According to Transport Canada, kids should also be able to sit up against the back of the seat with their legs bent comfortably over the edge at a 90-degree angle. The shoulder belt should lie flat over his collarbone without pushing against his neck or face, and it should never be tucked behind his back or under his arm. The lap belt should be secured over his hips, not his stomach. Once he meets all of these criteria and can sit like this for an entire car trip, he?s ready to ride without the booster. Read more: Is it ever OK to leave your child alone in the car">
Next steps

Kids older than 12 can sit up front, but according to safety experts, the back seat remains the safest place for pre-teens.
Tip

Front seat airbags can hurt small children if they inflate during a crash or sudden stop. The safest place for kids is always in the back seat. ?Transport Canada
Installation 101 

There?s more than one safe way to install a car seat. You can use the universal anchorage system (UAS), if your car has it, or a seat belt (with the addition of a locking clip if your belt...