Tommee Tippee Natural Start® bottles are #1 for easily switching between breast, bottle and back again*. Our soft silicone bottle teats have a built-in anti-colic valve that's proven to reduce air intake*. Our most breast-like bottle, ever. Shaped for comfort, engineered for ease, and designed to suit your feeding routine. Features: Designed to help reduce nipple confusion and make switching from breast to bottle and back again, easy 95% of babies accept a Tommee Tippee bottle* 3-step self-sterilising Leak proof with the lid on (even when upside down) Always BPA, BPS and Phthalate free