The Britax Frontier Toddler Car Seat allows parents to keep their children secure in a 5-point harness for as long as possible. Suitable for kids at least 25 lbs, 2 years of age, and 30" tall, the Frontier from Britax is best for parents graduating their little ones from a convertible car seat. Why such a high starting weight and age? Britax's commitment to best safety practices encourages parents to keep babies rear-facing as long as possible; to lower the limits would accomplish the opposite goal. Once junior grows out of the harness, the Frontier converts to a belt-positioning booster suitable for kids up to 100 lbs.