Philips AVENT BPA-Free 4-Ounce Natural Feeding Bottles with Newborn-Flow Nipples promote the health and comfort of your baby. Whether you are breastfeeding, bottle feeding, or combining the two, these AVENT feeding bottles support your choices. Developed using extensive research and clinical trials, these BPA-free bottles are proven to reduce fussiness* and colic. Designed for infants younger than one month--but suitable for breastfed babies of all ages--the bottles each have a 4-ounce capacity and an extra-soft silicone Newborn-Flow nipple with one hole, making them ideal for small feedings. Clinically Proven to Reduce Fussiness* and Colic** Clinically proven to reduce fussiness* and colic**, these AVENT bottles help your baby sleep well and digest properly. Each bottle features a two-piece anti-colic system that consists of the AVENT nipple and adapter ring. As your baby feeds, the unique skirt on the nipple flexes to allow air into the bottle and prevents any vacuum build-up. Listen for the gentle whistling sound and watch the air bubbles burst on the surface of the milk. That's your guarantee that the air is being released into the bottle--not into your baby's tummy. Newborn-Flow Nipples are Ideal for Breastfed Babies of All Ages The AVENT Newborn-Flow Nipples are single-hole extra-soft silicone nipples intended for infants younger than one month, yet they can be used by breastfed babies of all ages. Working with your baby's natural feeding rhythm, these nipples let your baby control the flow, more like breastfeeding, which can help reduce overeating and spit-up. Also, the nipples' natural shape promotes proper latch-on and makes it easier for your baby to switch between breast and bottle. Works with Full Line of AVENT Pumps, Bottles, and Cups Like all AVENT bottles, these Natural Feeding Bottles work interchangeably with the entire line of AVENT pumps, bottles, and cups. These 4-ounce bottles features single-hole newborn-flow nipples. However, as your baby grows, you may use different AVENT nipple, bottle, and cup styles to meet your baby's changing needs. If you prefer different AVENT nipples for these bottles, simply switch out the nipples for ones with a different flow. Each nipple style is imprinted with a number, making it easy to identify and customize your AVENT bottles. Easy to Clean and Use These hygienic bottles are easy to clean and assemble, as there are no small parts. The dome caps securely seal the AVENT nipples to ensure leak-proof feeding, mixing, and travel without the need for separate sealing discs. Shaped for stability and comfort, the bottles' waisted shape makes them easy to hold, while their wide-neck design makes filling a cinch. Clear markings on the bottles ensure accurate measurement and make it simple to determine how much your baby has eaten. All components of the Natural Feeding Bottles are BPA free. About Philips AVENT Since 1984 AVENT has been designing and manufacturing products that are inspired by nature and developed through extensive research and clinical trials. Now, as part of the Philips Group, Philips AVENT produces innovative solutions that make feeding and caring for your baby easier. The Philips AVENT product range includes breastfeeding, bottle feeding, toddler feeding, baby monitors, and newborn gifts. The products are designed to fit your busy life and make it easier for you to make the best choices for your baby.