This baby car seat allows babies and children from 9 to 36kg (20-80lbs) to travel forward facing in the front or rear of most cars.From 9 - 18kg - Seat is used with the integral 5 point one-pull harnessFrom 15 - 36kg - Harness removes, and child is secured by the adult seat belt. Backrest also removes to convert to a booster seat.