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The Tommee Tippee Closer To Nature bottles have been designed with the advice of breastfeeding experts, and are the perfect bottle to use alongside breastfeeding as it imitates the natural softness of a mother's breast.
There are two reasons a teat may collapse. One is an indication that your baby is ready for a faster flowing teat and may be sucking so hard that the teats can not release the air fast enough and collapses. The other is that the Closer to Nature Easivent teats are made from very soft silicone, therefore over time the silicone can remould when not in use, for example when on the shelf in store. All you need to do to rectify this problem is to rub the valve between your finger and thumb until the slit re-opens. You will only need to do this once and the teat should then function as normal.