NUK First Choice BPA Free Bottle with Size 1 Silicone Teat 300ml Supports breastfeeding & reduces colic. Bisphenol A (BPA) free. Made from polypropylene plastic. Suitable for ages 0-6 months.NUK's First Choice range was developed with Mums & Medical Experts worldwide to find the ideal feeding bottle. First Choice bottles have an extra wide neck to make it even easier to make the feed & clean, & the sealing disc & screw ring guarantee leak-proof transport. The First Choice teat has the special orthodontic NUK shape & an extra wide lip support to simulate breast feeding as closely as possible. For hygiene purposes & safety, replace the teat after 1-2 months use. The NUK Air System within the teat allows air to flow into the bottle though a vent. As the baby sucks, this ensures that no air is swallowed during feeding, thus helping to prevent colic. The NUK orthodontic shape & Air System have both been approved by the British Dental Health Foundation. Please Note: Colours & design may vary. The silicone teat on the bottle is size 1 (0-6 months), medium feed hole suitable for breast milk. Sterilise using Steam or cold water sterilisation. Do not place NUK products in the dishwasher as this can cause material damage. Also microwave sterilisation may cause material damage. The NUK Range The unique NUK orthodontic shape was developed over 50 years ago after intensive research by two German orthodontists, Professor Dr. W Balters & Dr. med. dent. A Muller. Their research found that prolonged use of conventional round teats & soothers could cause oral abnormalities like open bite. They therefore decided to develop a teat that is based on the shape of a mother's nipple during breast-feeding. By closely mimicking the sucking action of breast-feeding, NUK teats & soothers encourage the correct oral development for your baby. Because of our experience & expertise, NUK teats are used in many maternity & neonatal wards throughout the UK. In fact, NUK is currently used in over 200 hospitals, including Great Ormond Street, Alder Hey & Birmingham Children's Hospital. The NUK orthodontic teat is the only teat approved by the British Dental Health Foundation.