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 22 in. with placement 5 in. up each side of the base; back strap is 36 in. The booster that grows with your family; convert from baby booster to toddler seat by removing the foam insert; supports up to 33 lbs; assembled dimensions 17.25x15.25x11.75; tray holds your favorite plates up to 11 x 5 in 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