Hello and welcome to car-seat.org!
How old, tall, and heavy is your child?
The benefits of the Frontier are mostly for children who are very tall and heavy -- kids who need to be harnessed longer than most other seats will allow. Overall, though, your child will be better off staying rear-facing until closer to 4, forward-facing until 40 lbs and age 6 or so (or whenever s/he is mature enough to sit properly in a booster) and then switching to a dedicated booster at that point.
In the U.S., a seat like the Milestone would be a better and less expensive option for a child outgrowing an infant seat. The Milestone rear-faces, forward-faces, and can convert to a high back booster -- so it does everything that the Frontier can do, but can also keep your child rear-facing until 40 lbs. I don't think you have the Milestone in Canada, but are there other 3-in-one seats you might be able to check out?
Otherwise, I know that the Dimensions 65 is in Canada. It rear-faces for a long time, forward-faces for a long time, and then you could get a booster for when the child reaches that stage.
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