Philips AVENT Airflex PP Bottles 260ml SCF683/27 Pack of 2 Brand New, Sealed & Retail Packaged Comes with Slow Flow Nipple Teats Through extensive research and clinical trials, Philips AVENT products work effectively together to promote baby’s well-being and give you the flexibility to care for a growing baby. The Philips AVENT superior quality products at Babysecurity help to support the choices you make, whether breastfeeding, bottle feeding or combining the two. Then as your baby grows their interchangeable design features mean they can be adapted to meet your baby’s developing needs. The two piece anti-colic system consists of the AVENT Teat and adapter ring. As your baby feeds, the unique skirt on the AVENT Teat flexes to allow air into the bottle instead of your baby’s tummy. As with breastfeeding, your baby controls the milk flow. Milk, not air, flows into your baby’s tummy. Our Natural Feeding Bottles and teats utilize Airflex technology, which works with baby’s natural feeding rhythm to promote healthy, active feeding and reduce colic. The built-in Airflex valve allows your baby to control milk flow more like breastfeeding, which can help reduce overeating and spit-up. How it works As your baby feeds, the unique skirt on the AVENT teat flexes to allow air into the bottle, preventing any vacuum build-up. This allows your baby to suckle continuously and effortlessly, almost as at the breast. 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.