AVENT NIPPLE CLASSIC 6M+ ,Natural Fast Flow Nipple is designed for babies at least 6 months old and offer a fast flow. These nipples are made of soft, durable silicone, which is odorless, flavorless and BPA free. The nipples can be sterilized in any steam sterilizer, boiled for five minutes, or washed in the dishwasher,A wide breast-shape nipple promotes natural latch-on so you can easily combine breastfeeding and bottle feeding. Our flexible nipple design combined with the comfort petals allow for a natural movement while baby feeds. nipples are designed to reduce colic and discomfort by venting air away from your baby's tummy.