From grasping and shaking to sorting and stacking, the Ratna's sorting and stacking combos has tons of fun ways for your baby to play and explore. Babies can sort and stack all the toys, then bat at the wobbly base to see what happens, helping to enhance their curiosity and sense of discovery.While they're stacking the rings on the base from biggest to smallest, babies are starting to understand the concept of relative size. (Plus, it's super fun). Ratna's sorting and stacking toddlers toys (2 in 1 shape sorter ball & fantasy links).