The most natural way to bottle feed. Wide, breast-shaped silicone nipple promotes natural latch on, so its easy to combine with breastfeedingAdvanced anti-colic system is directly integrated into the nipple with no extra hard-to-clean partsMade of premium quality, pharmacy-grade borosilicate glass. Heat and thermal shock resistantWide neck opening for easy filling and cleaningCompatible with all Philips Avent Natural nipples. These bottles include 1Month+ Slow Flow nippleBPA-FreeWide, breast-shape and unique comfort petals promote natural latch-on and offer flexibility without nipple collapseAdvanced anti-colic system with innovative twin-valveHeat and thermal shock resistantCompatible with all Philips AVENT Natural nipples