Nuby's 3 Stage Teether Set grows with little ones as they go through the different stages of teething. Use step 1 for cutting front teeth, step 2 for front and middle teeth, and step 3 for those hard-to-reach back teeth. All stages of the teether set soothe, stimulate, and clean gums while being gentle on new teeth. Cool the teethers in the refrigerator to help soothe and ease little one's discomfort when teething gets extra tough. Baby will love the cooling relief. To make teething even easier, each teether is sized perfectly for a child's smaller hands. Nuby's 3 Stage Teether Set stimulates and delights baby with bright colors and fun shapes!