During breastfeeding, mum’s nipple will naturally flatten when in your baby’s mouth. These Vital Baby NURTURE™ teats are designed to mimic breastfeeding, which helps to reduce bottle confusion and can make transition between breast and bottle easier. This is the flexible area around the bottle teat which allows the teat to stretch and flex just like mum’s breast, making it more comfortable and natural feeling for baby to feed. Healthcare Professionals agree that the most common cause of colic in young babies is as a result of digestive or feeding problems, which are directly linked to swallowing air when feeding Air can be ingested by baby in 2 main ways during bottle feeding; air entering the bottle and mixing with the milk and baby ingesting air while feeding from the teat. Product Features: expertly designed to mimic mum’s breast, the teat feels and flexes like mum’s nipple flattened teat mimics the natural shape mum’s nipple makes when feeding advanced triple anti-colic valves to reduce air intake silicone is soft and smooth against baby’s delicate face easy latch teat wide neck makes them easy to clean 100% acceptance guaranteed, or your money back. BPA, Latex & Phthalate free