The Nuk First Choice Latex Teat has the special orthodontic NUK shape and extra wide lip support to simulate breast feeding as closely as possible. The NUK Air System within the teat allows air to flow into the bottle through a vent, as the baby sucks, this ensures that no air is swallowed during feeding, thus helping to prevent colic. The NUK orthodontic shape and Air System have both been approved by the British Dental Health Foundation. Size 1 is suitable for 0-6 months, and the medium feed hole is ideal for milk. Each pack contains 2 teats. For hygiene purposes and safety, replace the teat after 1-2 months use. NUK teats are Bisphenol-A free. Sterilise using Steam or cold water sterilisation. Do not place NUK products in the dishwasher as this can cause material damage. NUK Teats are available in various flow rates.