Meals as Easy as 1-2-3! Make mealtimes easier from baby through big kid with the Chicco Stack 1-2-3 high chair. This versatile multichair features 3 unique configurations that grow with baby from high chair to toddler booster, to youth stool. Multi-Function + Versatility. In its first mode, Stack 1-2-3 offers all the convenience of a standard high chair with a machine-washable seat pad, 5-point harness and 3-position recline for added comfort. The tray snaps easily onto the armrests for mealtime and onto the rear legs for storage. As baby grows into a toddler, the lightweight high chair seat is easy to detach from its frame to create a high-back booster that secures to dining chairs for meals directly at the table - at home or away. Rubberized pop-out feet for the booster help protect chairs. The high chair frame doubles as an easy-access big kid stool with a contoured seat and sturdy backrest. You can even use Stack 1-2-3 with two children at once: your big kid on the youth stool and your little one in the booster. Stack 1-2-3 is designed for children up to 40 lbs. in high chair mode, up to 50 lbs. in booster mode, and for children at least 3 years old and up to 60 lbs. in stool mode. In booster mode, use only on dining chairs with a seat at least 15" wide, 14" deep and a backrest at least 12" high.