What makes Philips Avent Natural nipples unique? Using Philips Avent nipples to feed your baby comes with a lot of benefits. Find out what makes Philips nipples so unique. Comfort petals The new Avent Natural nipple has unique comfort petals, reducing leakage and nipple collapse. Twin-valve design Avent Natural nipple has an innovative twin-valve design with an open frame for effective functioning. Natural latch The Natural nipple endorses natural latch on, and high nipple acceptance.