6 months & up. Baby will have fun stacking and learning with the colorful Teether Tower. The five, textured teethers are BPA- and PVC-free and filled with distilled water that can be chilled in the refrigerator for extra relief for teething gums. Teethers stack together on a natural wood base. Stimulates baby's sensory, movement, interactive, and cognitive learning pathways for early, whole development.