"Our most breast-like bottle, ever. Makes switching from breast to bottle and back again, easy. Soft, silicone nipple, that flexes and stretches like a breast Anti-colic valve, to keep gas away from baby’s tummy Speedy self-sterilizing, in just three minutes in the microwave 100% leakproof with the lid (even when upside down) It’s also BPA free" Natural latch: Our bottle nipples are shaped to encourage a natural latch, reducing air intake and preventing nipple confusion when switching between breast, bottle and back again. Anti-colic: Tommee Tippee Natural Start nipples feature an innovative anti-colic valve which reduces air ingestion, helping to reduce the symptoms of colic. Pace feeding: The soft silicone nipple flexes and stretches like a breast and allows your baby to feed comfortably at their own pace. Self-sterilizing: Tommee Tippee Natural Start bottles can be easily self-sterilized in the microwave in just three minutes. 100% leakproof: When the screw ring, nipple and cap are all secured, your baby bottle is completely mess-free and leakproof, even if it’s turned upside down or shaken Tommee Tippee SKU:52254926