Avent Philips Baby Feeding bottles (PP) 2 x 125ml Bottles The Avent bottles are available in both polypropylene (PP) and polyethersulfone (PES). PES plastic is amber coloured and is quite durable, whereas polypropylene is a go-to BPA-free material, so which you choose is up to you. Sleep and nutrition are vital to your baby’s health and happiness. Clinical studies show that the AVENT bottle is clinically proven to reduce fussing and colic . Fussing is reduced especially at night. The naturally-shaped nipple, combined with the fact that your baby controls milk flow more like breastfeeding, makes it easier to combine breast and bottle . As your baby feeds, the unique skirt on the AVENT nipple flexes to allow air into the bottle, preventing any vacuum build-up. This has a built in airflex valve. This allows your baby to suckle 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. There is no known cure as of yet. However, using the Philips AVENT bottle has been clinically proven to reduce infant colic and fussing by limiting the air that your baby ingests with our anti-colic valve. Feeding your baby slowly, in an upright position whilst regularly burping can also have a positive effect. Purchase additional teats for your baby bottle.