300ml plastic bottles with silicone teat NUK first choice+ bottles are designed to be used with first choice+ teats. The first choice+ teat replicate a mother's nipple during breastfeeding and features the special, orthodontic, asymmetrical NUK shape, an extra wide lip support and new extra soft tip to fit baby's mouth perfectly, simulating breastfeeding as closely as possible - so true to nature that most babies hardly notice the difference. Clinically proven for optimal combination of breast and bottle feeding* the NUK improved anti-colic air system helps to prevent colic by allowing air to flow into the bottle through a vent. This ensures that no air is swallowed during feeding