When you re looking for one of the best teethers for babies invest in the Learning Curve Keys Teether from The First Years. Babies love to teethe on the rounded edges of this classic baby toy for teething relief! This teether features five brightly-colored keys that make a lively click-clack sound as they swing--a smart design that stimulates a baby s sense of sight and sound. Each key has a different shape and color which also makes this teething toy the perfect learning curve tool for teaching babies colors counting and number recognition. Keep your baby comfortable and occupied while you simultaneously teach them new things with the Learning Curve Keys Teether.