Philips Avent Natural Slow Flow Nipple is designed for babies at least 1-month-old and feature a slow flow. These nipples are made of ultra-soft, durable silicone, which is odorless, flavorless and BPA free. The nipples can be sterilized in any Philips Avent steam sterilizer, boiled for five minutes, or washed in the dishwasher. A wide breast-shaped nipple which promotes natural latch-on so you can easily combine breastfeeding and bottle feeding. The ultra soft nipple mimics the feel of the breast. Our flexible spiral design combined with the comfort petals allow for a natural movement while baby feeds. Unique Airflex vent technology is integrated into the nipple and is designed to reduce colic and discomfort by venting air away from your baby's tummy.