Avent 125 ml Feed Bottle (Newborn flow teat) The AVENT Airflex Feeding Bottle uses the unique AVENT Airflex Teat, which promotes healthy, active feeding & works with baby's natural feeding rhythm. The Airflex Teat makes it easier for baby to switch between breast & bottle. The Feeding Bottle has a built-in valve that works with your baby's natural feeding rhythm to promote healthy, active feeding. The baby naturally controls milk flow Your baby controls milk flow more like breastfeeding, which can help reduce over eating & spit-up. Supports breastfeeding Naturally shaped teat promotes proper latch-on & makes it easier to combine breast & bottle. Clinically proven to reduce colic A clinical study demonstrated that at two weeks of age, babies fed with the Philips AVENT Bottle experienced less colic than babies fed with a conventional bottle. Simple to assemble & ultra hygienic Because the valve is built into the teat, there are less parts for you to assemble & clean, making the Philips AVENT Feeding Bottle ultra hygienic & simple to use. How does the Philips AVENT bottle reduce baby wind or colic? Feeding bottles, whether they are angled or straight, require air inside the bottle to replace the milk your baby takes. When your baby drinks, a vacuum is formed in the bottle causing the teat to collapse, restricting milk flow. Unable to receive milk, a frustrated baby's natural reaction is to suck more vigorously which in turn increases the amount of air swallowed. Most bottles require air to flow in through the hole in the tip of the teat to remove the vacuum, interrupting the flow & rhythm of sucking. Philips AVENT teat's unique one-way air valve opens & closes with baby's natural suckling rhythm, letting air flow into the bottle as your baby drinks, preventing the vacuum from forming. The result is less air in the tummy & a decrease in colic. A recent clinical study demonstrated that at two weeks of age, babies fed with the Philips AVENT bottle, showed less colic, & behaved more like breastfed babies.