The Safety 1st EverSlim All-in-One Convertible Car Seat keeps your child secure and comfortable through every age and stage, with 4 modes of use—rear-facing (5–40 lbs., 19"–40"), forward-facing (22–65 lbs., 29"–49"), belt-positioning booster (40–100 lbs., 43"–52") and backless booster (40–100 lbs., 43"–57"). The seat’s ultra-slim design fits 3 across most back seats without sacrificing comfort. The SecureTech™ red-to-green indicator on the chest clip allows you to see when your child’s chest clip is securely fastened. With a 5-position-recline adjustable base, a 1-hand 10-position adjustable headrest, an easy-to-convert backless booster, and machine washable and dryable fabric, it’s the only car seat your child will need, from birth through age 10.