Philips Avent Natural Slow Flow Nipple is intended for newborns over the age of one month and has a slow flow. These nipples are constructed of odorless, flavorless, and BPA-free silicone that is incredibly soft and sturdy. The nipples may be sanitized in any Philips Avent steam sterilizer for five minutes, boiled for five minutes, or cleaned in the dishwasher. A large breast-shaped nipple that encourages natural latching, allowing you to seamlessly mix nursing and bottle feeding. The incredibly delicate nipple feels like a breast. The comfort petals and our flexible spiral design allow for natural movement as baby eats. The nipple contains a unique Airflex valve technology that is meant to alleviate colic and pain by venting air away from your baby's belly.