6 months & up. Delight little ones with this bundle designed to engage the senses and inspire early learning! The Happy Sound Soft Blocks and Rattle Block sets are soft, textured blocks great for varied sensory play. This set features single and double blocks, as well as special rattle blocks filled with colorful beads that produce gentle, cheerful sounds, sparking curiosity and exploration. Sized perfectly for small hands, these safe, squeezable pieces encourage grasping, shaking, and stacking while supporting fine motor skills, hand-eye coordination, and early cause-and-effect learning. It's the perfect combination of sensory fun and developmental play for growing minds.