Rock-a-Stack toy lets baby sort & stack the five colorful rings, then bat at the wobbly rocker base to discover what happens | Stacking rings on the base from biggest to smallest helps baby understand the concept of relative size | Babies First Blocks offer put & take play, as well as stacking, sorting and matching to help baby develop problem-solving skills | Grasping & sorting help baby develop finger & hand dexterity | Placing blocks in bucket helps strengthen eye-hand coordination