Philips Avent Natural Baby Bottle is the most natural way to bottle feed. The wide breast-shaped nipple promotes natural latch-on so you can combine breastfeeding and bottle feeding. Our flexible spiral design combined with the comfort petals allow for a natural movement while baby feeds. The nipples have Airflex vent technology and are designed to reduce colic and discomfort by venting air away from baby's tummy. BPA free products.