Features:  • 9oz  • Pack of 2 bottles  • Natural latch: Nipples designed to promote a natural latch, reducing air intake and preventing nipple confusion when transitioning between breast and bottle  • Anti-colic: Tommee Tippee Natural Start bottle nipples feature an innovative anti-colic valve that minimizes air intake, helping to reduce colic  • Natural flow: The soft silicone nipple is flexible and stretches like the breast, allowing your baby to feed comfortably at their own pace  • Self-sterilizing: Tommee Tippee Natural Start bottles can be easily sterilized in the microwave in just three minutes  • 100% leak-proof with the lid: When the screw ring, nipple, and cap are all in place, the bottle is completely leak-proof, even when turned upside down or shaken