Your options have never been better with our 4 pack, 2oz, Anti-Colic Baby Bottle. The anti-colic internal vent system is clinically proven to reduce colic. Our bottles provide a more comfortable feeding experience for the baby by decreasing spit-up, burping and gas. This vacuum-free feeding is closest to breastfeeding and silicone nipples provide a consistent flow so the baby can feed at their own pace. The breast-like nipple shape encourages a proper latch for a more natural bottle feeding experience and eases the transition from breast to bottle and back again. Our vent system is proven to help preserve bottle milk nutrients and aids in digestion for a better night's sleep. The silicone nipple, together with the internal vent system, offer a reliable and trusted bottle feeding experience.