Plastic bottle with narrow neck \ \ ergonomically designed bottle with a wide neck that makes it easier to fill and hold. Made from modern and safe plastic without bisphenol – a. It has a natural flow system and a transparent silicone nipple, which due to its wider base is preferred by breastfeeding mothers. \ \ options series \ \ the first reversible bottle on the market that can be used with or without the air passage system. Although it is recommended that the air passage system is always installed to enjoy all the health benefits of our bottles - it helps reduce feeding problems, aids in digestion & preserves vitamins, the dr browns options bottle will work as a compatible bottle if the air passage system is not installed. simply remove it! \ \ some moms and dads find it a convenient option as their baby's feeding develops over time or the baby no longer has symptoms of colic. the power of choice! \ \ the innovative bottle that effectively and efficiently meets all the needs of parents. dr browns options grows with your baby's needs and offers healthy benefits, whether your little one experiences feeding difficulties or not. \