The Stay Stacking Blocks with Interlocking Design are a set of colorful building blocks specifically designed for babies aged 12-36 months. With dimensions of 5.00 x 5.00 x 5.00 inches and a weight of 3.858 lb, these blocks are perfect for little ones to handle and stack together. The interlocking design helps to encourage hand-eye coordination and fine motor skills, making playtime both fun and educational. Suitable for both boys and girls, these blocks provide hours of entertainment and stimulation for young children.