To assemble the Ingenuity Baby Base, remove the tray, turn seat over and remove the seat back from underneath the base (tip: chair straps are also stored under the seat), and place seat back onto the top of the base; back not removable after installation Safe infant seat with harness for babies sitting up; adjustable straps attach the booster to most dining chairs; bottom straps are 55.9 cm. with placement 12.7 cm. up each side of the base; back strap is 91.4 cm. The booster that grows with your family; convert from baby booster to toddler seat by removing the foam insert; supports up to 15 kg; assembled dimensions 43.82 x 38.74 x 29.85 cm; tray holds your favorite plates up to 28 x 12.7 cm. This easy to clean feeding seat has a removable BPA-free tray that can be stored neatly under the booster seat; clean the base and foam insert by wiping clean with damp cloth and mild soap and let air dry; tray is dishwasher safe Smart multi-functional design; booster seat for dining table or can be used as a floor seat; compact footprint is easy to enjoy at home or bring on the go