The Crosstown Slim All-in-One Convertible Car Seat is made to be with you for years, comfortably fitting your little one from birth to 10 years with 3 modes of use: rear-facing (5–40 lbs., 19"–40"), forward-facing harness (30–65 lbs., 34.4"–49"), and belt-positioning booster (40–100 lbs., 43.4"–52"). Its ultra-slim 17" design is a space-saver you’ll welcome as it allows for 3 across the back seat of most cars. The 1-hand adjustable harness and 8-position headrest ensure the proper fit and keep your little one comfy, all without the need to rethread the harness during adjustments.