The BornFree Vented Glass Bottles Gift Set offers three 5-oz. bottles, two 9-oz. bottles and a twin-pack of Level 2 nipples. These leak-proof and BPA-free glass bottles feature an anti-colic vent designed for safe and comfortable feeding. The simple 2-part venting system reduces vacuum build-up inside the bottle, allowing a continuous free flow of air into the nipple while the baby is feeding. This system helps reduce gas, spit-up, colic and the risk of ear infections, while the flow mimics breastfeeding, making the transition from breast to bottle easier. The bottles are built with great precision to prevent leaking - simply secure the BornFree venting system to eliminate leaks. With a glass bottle, there are no leftover odors, less bacteria build-up and no aftertaste. -Features-Fine dining - The two 9-oz. bottles and three 5-oz. bottles are made of glass with great precision to prevent leaking Personal fit - Two Level 2 nipples are included in the gift set, offering a medium flow for feeding that imitates breastfeeding Babies know best - The 2-part venting system provides a continuous flow while feeding to reduce colic and help prevent ear infections -Safety first - BornFree was founded on the desire to deliver products that are BPA-free and safe for children, like this gift set of glass bottles