Product Description Philips AVENT SCF632/27 Classic Slow Flow Nipple lets infants control the flow of milk like with breastfeeding, which can reduce spit-up and overeating. Philips AVENT's anti-colic valve flexes to keep air in the bottle and out of your baby's tummy, a feature that reduces fussing and colic. In a clinical trial, two-week-old infants fed with a Philips AVENT Classic bottle experienced less colic than babies fed with a conventional bottle, with the greatest difference seen at night. Appropriate for babies at least 1 month old, these dual-hole nipples offer a slow flow. The nipple is made of flavorless, odorless silicone that resists discoloring and stickiness. The nipple's soft, rounded shape promotes feeding for babies who nurse from both the breast and a bottle. The Classic BPA Free nipples are dishwasher safe and can be sterilized by boiling for five minutes or by using a Philips AVENT steam sterilizer. From the Manufacturer The Philips AVENT slow flow nipple is made of extra soft silicone and is ideal for newborn and breastfed babies. The naturally shaped nipple makes it easier to transition from breast and bottle feeding and the anti-colic valve promotes active feeding and reduces fussiness and colic with less air in baby's tummy.