Tommee Tippee Advanced Anti-Colic Baby Bottle Teats, Medium Flow, 3m+, Pack of 2To help reduce pollution and end deforestation we use responsibly sourced recyclable cardboard.Brighter futures™Good to know! advanced anti-colic™ teats are only suitable for use with Tommee Tippee advanced anti-colic bottles.Choosing babys flow0m+ slow flow 13m+ Med flow (2)6m+ Fast flow (3)Signs its too fast... gulping, coughing or gagging, refusing to feed, or excess milk dripping out of babys mouth.Or too slow... if baby takes over 20 minutes to finish a feed, tugs at the teat or falls asleep while feeding, they may need a faster flow.Materials listing: Silicone.Complies with EN 14350.All IP rights held by Mayborn (UK) Limited and/or its affiliates.Patented; www.tommeetippee.com/en-us/legals/patent, EP1863427 and EP1765257.Registered Design; www.tommeetippee.com/en-us/legals/patent, RCD000400734-0003.Tommee Tippee®, Adv