This 2-pack of Philips Avent Classic fast flow replacement nipples is designed for babies at least 6 months old. Each soft silicone nipple features four holes for a faster flow suited to older, faster-drinking babies. The naturally shaped nipple makes the transition between breast and bottle feeding easier, and the built-in anti-colic valve promotes active feeding with less air in baby's tummy to reduce fussiness and colic, clinically proven to reduce colic and discomfort. Made of soft, durable, flavorless silicone and completely BPA free. These nipples are for use with Philips Avent Classic and Classic+ feeding bottles.