Cybex Sirona G3 i-Size Rotating Car SeatCYBEX Sirona G3 i Size 360 Rotating Toddler Car Seat Rear Facing to 4 Years The CYBEX Sirona G3 i Size is a 360 rotating toddler car seat designed to keep children travelling rear facing from approximately three months up to four years old, and from birth with the optional double newborn inlay accessory (sold separately). Certified to UN R129 04 and holding both an AGR back health seal and a Red Dot Award, the Sirona G3 combines proven safety