Dr. Brown's Preemie Flow Bottle Set is made with premature babies or newborns that need a slower flow nipple in mind. The Preemie Flow Nipple allows premature babies and infants that need a slower flow to feed comfortably. Great for breastfed babies too! When baby's feeding has progressed, switch to the Level T nipple. Level T Nipples are designed for babies requiring a slower flow nipple than Dr. Brown's Level 1 Nipple or needing to transition up slowly from Dr. Brown's Preemie Flow Nipple. The nipple, together with Dr. Brown's Anti-colic internal vent system, is clinically proven to reduce colic. Dr. Brown's bottle and nipple provide a more comfortable feeding experience for baby by decreasing spit-up, burping and gas. This vacuum-free feeding is closest to breastfeeding and Dr. Brown's Nipples provide a consistent flow so 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. The Preemie Flow and Level T Nipple and Anti-Colic vent system is proven to help preserve bottle milk nutrients and aid in digestion for a better night's sleep. Made of super-soft, 100% silicone, the Preemie Flow and Level T Nipples fit all Dr. Brown's Narrow bottles. Always use the vent system with Preemie Flow and Level T Nipples. Safe for use in dishwasher (top rack only), electric and microwave sterilizers or boiling water. 0m+. BPA free. *IQVIA Health ProVoice Survey 2024.