Tommee Tippee Natural Start Anti-Colic Bottle.

Natural latch: Our bottle teats are made from soft silicone and have a special breast-like shape that encourages a natural latch, preventing nipple confusion when switching between breast, bottle and back again
Anti-colic: The bottle’s teat features 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 just like mum and allows your baby to feed comfortably at their own natural pace
New self-sterilising: Our baby bottles can now be self-sterilised, killing viruses and 99.9 Percent of bacteria***. Simply fill with 50ml of water, replace the teat and cap and heat in the microwave for 3 minutes
100 Percent 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