NUK Signature Soother: Shaped by Nature. Designed with love. Heart-shaped mouth shield with even smoother, softer shapes – with a fashionable ring to grip. Modelled on a mother's nipple while breastfeeding, which promotes healthy oral development. Thinner and narrower teat neck reduces pressure on jaws and teeth. Flat baglet and smooth underside; pleasant feeling in mouth; plenty room for natural sucking movements.