Nuk first choice43 baby bottles are clinically proven for optimal combination of breast and bottle feeding the bottles feature the original nuk orthodontic asymmetrical shaped teat which is designed with a special super soft zone which adapts perfectly to babys palate simulating breastfeeding as closely as possible so true to nature that most babies hardly notice the difference r r the teat has an extra wide lip support and the improved nuk anti colic air system minimises infant colic