The next generation diono Radian all-in-one convertible car seat that transforms as your child grows from baby to booster for 10 years one car seat (4 - 120 lb). Now upgraded with 20 improvements from the award-winning Radian 3RXT. Advanced 3-in-1 rear facing protection with SafePlus engineering to provide the next generation in convertible car seat safety. Radian 3QX provides baby and infant protection, with SafePlus newborn baby travel high wedge and 2-in-1 infant positioning liner for a custom fit from 4 lb. As your child grows the SafePlus steel rear facing anti-rebound bar increases stability and reduces rebound rotation by up to 50%, so you can keep them in a safe rear facing convertible car seat for longer up to 50 lb. As both a rear and forward facing convertible car seat the Radian 3QX protects as they grow, with the SafePlus easy adjust 12 position headrest that offers a 22% increase in occupancy range from the Radian R series. With 6 layers of side impact protection, SuperLATCH connectors (UAS Compatible) and safe 5-point harness, the Radian 3QX provides advanced safety from rear facing to forward facing harness booster to belt positioning booster modes.