Features: - 4 STAGE COMPLETE NEWBORN PROTECTION - Features Safe+™ newborn travel high wedge, Safe+™ newborn protection insert, Safe+™ 2-in-1 infant positioning liner and Safe+™ newborn harness pads to provide a custom fit from birth. -10 YEARS 1 CAR SEAT - With 5 ways to travel from birth to booster, the radian® 3QXT adapts as your child grows to offer a custom fit from birth up to 120 lb. -REAR FACING FOR LONGER - Designed and engineered with all new Diono Safe+™ protection. Now you can keep your child rear facing for even longer up to 50 lb (approx. 4 years old). -SLIM-FIT DESIGN FITS 3 ACROSS - Built with our famous radian® slim fit design, to fit 3 across in most vehicles without compromising child or passenger comfort. - From baby's first journey the radian® 3QXT provides complete newborn protection, with Safe+™ newborn travel high wedge, Safe+™ newborn protection insert, Safe+™ 2-in-1 infant positioning liner and Safe+™ newborn harness pads to provide a custom fit from birth. -As your child grows the Safe+™ steel anti-rebound increases stability and reduces rebound rotation by up to 50%, so you can keep them safely rear facing for longer, up to 50 lb (approx. 4 years old). -The radian® 3QXT features 8 layers of side impact protection, that includes a removable Safe+™ side impact management pod, constructed to channel energy around the back of the car seat and away from the child in the event of a side impact. This forms two of the 8 layers of interlocking EPS and EPP foam, high density plastic and steel reinforcement to create ultimate side impact protection, without compromising 3 across fit in most midsize vehicles. -As they transition to forward facing, the Safe+™ easy adjust 12 position headrest is contoured to improve child head containment and provides a 22% increase in occupancy range from the radian R series. -Steel reinforced cup holder -SuperLATCH connectors for a easy click installation Rear-facing: 4-50 lb / 1.8-22.7 kg Forward-facing: 22-65 lb / 10-29.5 kg Booster mode: 40-120 lb / 18-54 kg Seated torso height: 7.5-16.5″ / 19-42 cm Overall maximum height: up to 57″ / 144.8 cm Weight: 25.8 lb / 11.7 kg