Bat, stack, shake, soothe, and discover with the Baby Einstein Stack & Wobble Zen Teether Toy. This colourful wobble toy helps encourage baby’s cause & effect learning. Brightly coloured, BPA-free rings are textured to soothe sore gums and help build baby’s early sensory skills. Featuring Zen the Zebra from Baby Einstein shows and books, smaller infants will love to bat the stacker to make Zen wobble, promoting cause & effect learning and engagement.