Natural latch: Our bottle teats are shaped to encourage a natural latch, reducing air intake and preventing nipple confusion when switching between breast, bottle and back again. (Slow flow teat included with each bottle) Anti-colic: Tommee Tippee Natural Start teats feature an innovative anti-colic valve which reduces air ingestion, helping to reduce the symptoms of colic Pace feeding: The soft silicone teat flexes and stretches like a breast and allows your baby to feed comfortably at their own pace Self-sterilising: Tommee Tippee Natural Start bottles can be easily self-sterilised in the microwave in just three minutes 100% leakproof: When the screw ring, teat and cap are all secured, your baby bottle is completely mess-free and leakproof, even if it’s turned upside down or shaken