6 months & up. This classic, colorful toy is fun for little ones! Younger babies will love grasping, holding, shaking and exploring the five colorful rings. The top ring has a shiny, reflective surface with colorful, swirling beads that make fun rattle sounds! When babies are ready to sit and stack, they can place the rings on the post and bat at the wobbly base to make it rock back and forth. Stacking helps develop hand-eye coordination and introduces the concept of relative size as babies learn to sort and stack from largest to smallest.