The Evenflo SafeMax is an All-in-One car seat, accommodating children from birth through booster. Rear-facing it can be used for infants and young children from 5 – 40 lbs (19 – 40 in). Safety advocates recommend that children ride rear-facing as long as possible. Forward-facing, the Evenflo SafeMax All-in-One can be used for children at least one year old and 22 – 65 lbs (28 – 50 in). Finally, in high back booster mode this car seat can be used for children at least four years old and from 40 – 120 lbs (44 – 57 in).