The 4 in 1 Graco car seat is designed to grow with your child from infancy all the way up to their tween years, allowing for a safe and comfortable ride every step of the way. The four stages include: (1) Rear-Facing Infant Car Seat – This stage is ideal for infants from 4–40 lbs. It features a 5-point harness system to secure your child in place, as well as an adjustable headrest that can be raised or lowered as your baby grows. (2) Forward-Facing Harness Car Seat – Once your infant has outgrown the rear-facing stage, they can transition into this forward-facing model which offers side impact protection and fits children 20–65 lbs. An adjustable headrest allows room for growth while keeping them safe and comfortable on longer rides; (3) Booster Seat - When kids have outgrown the harnessed car seat, it’s time for them to move into booster mode where they can use either the vehicle’s lap/shoulder belt or a high back booster style with an integrated 5 point harness system up until 100 lbs.; (4) Backless Booster - Finally, when kids reach 40+lbs. , they will need this backless booster option so that their seatbelt fits correctly across their shoulder and hips. With its lightweight design, it makes transitioning between cars easier than ever before!