3 months & up. The Stack N Chew™ Mini Cubes are the perfect developmental teething toy, designed to engage babies through stacking, squeezing, and chewing. Made from BPA-free, food-grade silicone, these cubes are safe for baby's tender gums, providing gentle relief during teething. Their flexible holes help strengthen gripping skills, while the contrasting modern colors stimulate hand-eye coordination and promote motor skill development through stacking and carrying. Lightweight and easy to travel with, these cubes encourage imaginative play. Featuring textured edges for chewing, an easy-grip design, and stackable construction, they offer both fun and functionality for growing little hands. Dishwasher and dish soap safe. Do not microwave. Monitor for wear and tear and discontinue use if damaged.