The Safety 1st EverSlim 4-in-1 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 (30–65 lbs., 34.4"–49"), belt-positioning booster and backless booster (40–100 lbs., 43.4"–52"). The seat’s ultra-slim design—just 17.3” across without the cup holders—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.