Clinically testedThe natural form of the NUK teat has a very high acceptance by babies. Therefore, it is especially suitable for babies who are breastfed by the mother and with a bottle. * Helps prevent colicThe NUK Air System Anti Colic System allows airflow management so the baby can drink in a relaxed way , without swallowing air. ** Light and transparent polypropylene bottle: The extra-large spout facilitates filling and cleaning. The bottle's slightly tapered shape allows for a firm grip and the wide base offers the necessary stability. Ask us about the different patterns!