6 months and up. Every side of these soft fabric blocks features another way for children to learn through play. Young children can practice fine motor skills and color and shape recognition while stacking and sorting the pieces of this block set. Textured sides enhance sensory-based play and opportunities for tactile exploration. Set includes 12 lightweight blocks: 3 red, 3 green, 3 blue, and 3 yellow. Each block measures 3"L x 3"W x 3"H.