Tommee Tippee Natural Start Grow With Baby Bpa Free Bottle 13 Piece Set, 2 X 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) BPA free What?s included: 2 x 5oz Natural Start baby bottles, 3 x 9oz Natural Start baby bottles, 1 x 11oz Thicker Feed Natural Start baby bottle, 2 x medium-flow nipples, removable bottle handles, bottle nipple brush, 3 x bottle travel lids What's Included: 2 x 5oz Natural Start Bottles, 3 x 9oz Natural Start Bottles, 1 x 11 oz Natural Start Bottle, 2 x medium flow nipples, 1 x removable bottle handles, 1 x bottle nipple brush, 3 x bottle travel lids Designed For Seamless Transition Between Bottle and Breast: Natural Start bottles have silicone nipples that are designed with an anti-colic valve and mimic the flexibility of a breast 100% Leakproof Bottle to Avoid Messes: When the screw ring, nipple and cap are all secured, your baby bottle is completely mess-free and 100% leakproof, even if it's turned upside down Designed For Pace Feeding: The soft silicone nipple flexes and stretches like a breast and allows your baby to feed comfortably at their own pace and stop when full Self-Sterilizing Bottles: Tommee Tippee anti-colic bottles can be easily self-sterilized in just three minutes making cleaning quick and convenient for busy moms