Featuring our slowest-flow nipple, the Dr. Brown's Preemie Nipple that offers a very slow flow for babies who are premature or with feeding difficulties An enhanced, anti-colic internal vent system features innovative feeding experience that's clinically proven to reduce colic, decreases spit-up, burping and gas. Together with the Preemie Flow Nipples, the Options+ Narrow Preemie Bottle offers a flow rate that supports breastfeeding Options+ Narrow Preemie Bottles fit most breast pumps Dishwasher (top rack) and sterilizer safe, BPA free, 0m+ The best baby bottles are also the perfect baby bottles for preemies! Dr. Brown's Natural Flow Options+ Narrow Preemie Baby Bottles are sized just right for premature babies. Dr. Brown's Preemie Baby Bottles feature our slowest-flow nipple, the Dr. Brown's Preemie Nipple that offers a very slow flow for babies who are premature or with feeding difficulties. The small, 2 oz/60 ml Options+ bottles are sized just right for small tummies. An enhanced, anti-colic internal vent system features innovative feeding experience that's clinically proven to reduce colic, decreases spit-up, burping and gas, better preserves nutrients in breast milk and formula, and aids in digestion for a good night's sleep. Together with the Preemie Flow Nipples, the Options+ Narrow Preemie Bottle offers a flow rate that supports breastfeeding. Options+ Narrow Preemie Bottles fit most breast pumps. Included are two (2) 2 oz/60 ml Options+ bottles and two (2) Preemie Flow Nipples.