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Sleep and nutrition are vital to your baby's health and happiness. A randomised clinical trial was carried out to see whether infant baby bottle design affects "infant behavior". The Philips Avent Classic baby bottle was shown to significantly reduce fussing by approximately 28 minutes a day as compared to the competitor bottle (46 min vs 74 min, p=0.05) This was especially true during the night-time.**This nipple is made from silicone - a BPA-free material (Following EU directive 2011/8/EU). As your baby feeds, the unique valve on the nipple flexes to allow air into the bottle instead of your babys tummy. The Philips Avent Classic bottle offers different flow rates to keep up with your baby's growth. Remember that age indications are approximate as babies develop at different rates. All nipples are available in twin packs.We advise to use the Classic nipple with Classic baby bottles only. Our Classic+ nipple has a new design and is now even easier to clean. Unique valve on the nipple flexes to your baby's feeding rhythm. Milk will only flow at the pace chosen by your baby to minimize overeating and spit-up, burping and gas.