Sleep and nutrition are vital to your baby"s health and happiness. A randomised clinical trial was carried out to see whether infant feeding bottle design affects "infant behavior". The Philips AVENT bottle was shown to significantly reduce fussing by approximatley 28 minutes a day as compared to the comparator bottle. This was especially true during night-time. The two-piece anti-colic system consists of the AVENT Nipple and adapter ring. As your baby feeds, the unique skirt on the AVENT Nipple flexes to allow air into the bottle instead of your baby"s tummy. Like natural breastfeeding your baby controls the milk flow.