Avent Anti-colic Medium Flow Teats is a healthy, active feeding & Unique anti-colic valve proven to reduce colic. BPA-Free teat allows your baby to control milk flow more like breastfeeding, which help reduce overeating and spit-up. A responsive valve & unique skirt system flexes to allow air into bottle and promotes healthy, active feeding and reduces colic. Ribbed teat Secure Latch Size 2 Medium flow teats. Suitable for 3 months+ babies.