NUK First choice+ Ventilated air system Physiological form. Anti-colic Respects the development of the oral cavity Transparent silicone Size 2, from 6 months and up Holes M (infant milk) and L (thick liquids and porridge) x 2 teats The Nuk First Choice+ physiological teat respects the development of the oral cavity and promotes good digestion in babies. It is even softer thanks to the new Soft Zone. Teat developed by a team of doctors, pediatricians and dentists. Recognized as the best reproduction of the mothers breast. Incorporates the Air System ventilation system to reduce the risk of colic and hiccups in the baby. Pre-shaped to adapt to the babys oral cavity, it resembles the shape of the nipple during feeding. Its hole is made on the roof of the mouth: allows milk to mix well with saliva optimizes the babys digestionPluses of the product Available in sizes 1 (0-6 months) and 2 (+6 months) in silicone and natural rubber with 3 different holes: S, M and L Valve Air System: controls the air entering the bottle and reduces the risk of colic and hiccups Widened base: to allow the baby to position his mouth as during breastfeeding Fits all Nuk First Choice+ bottles Holes designed to guarantee the ideal flow rate for different types of power: - S: Water, breast milk - M: Infant formula milk - L: Porridge, thickened milk, thick liquids