Baby Brezza Glass Natural Bottles are new & improved and still a breeze to feed & clean. They feature an improved sealing and closure system that prevents leaks and is easy to open/close. Plus, with only 2 parts and an ultra-wide mouth, they are the only natural bottle that's easy to clean & assemble. Your baby can easily transition between breast & bottle with its wide, breast-like nipple. Each nipple features the TruFlo® Anti-Colic System so your baby swallows milk, not air. BPA-FREE. You and your baby will love them!