The Grow and Go™ Sprint All-in-One Convertible Car Seat has multiple comfort adjustment options to fit kids from birth to 10 years in three modes of use: rear-facing (5–40 lbs., 19"–40"), forward-facing (30–65 lbs., 34.4"–49"), and belt-positioning booster (40–100 lbs., 43.4"–52"). As your little one grows, the QuickFit™ harness lets you adjust the headrest and harness with one hand, in one quick motion. No re-threading. No re-installing.  In forward-facing mode, our seat has two position options to get the best possible fit in your vehicle. The seat pad is made with antimicrobial fabric to inhibit the growth of bacteria and odor-causing microbes. When flailing arms and legs make it hard to get kids in and out of the seat, our harness holders keep straps out of the way. And since messes are bound to happen, the machine-washable and dryer-safe seat pad removes smoothly for easy cleaning. Actual fit may vary. Not all children will comfortably fit in the seat for the full weight and height ranges listed.