This vacuum-free feeding experience is closest to breastfeeding, with Dr. Brown’s® silicone nipples providing a consistent flow that allows baby to feed at their own pace, while the breast-like nipple shape encourages a proper latch for a more natural bottle-feeding experience and helps ease the transition from breast to bottle and back again, and the internal vent system is proven to help preserve bottle milk nutrients and support digestion for better sleep, with the silicone nipple and vent system together offering a reliable, trusted feeding solution that makes Dr. Brown’s the #1 Pediatrician Recommended Baby Bottle in the U.S.*, designed to grow with baby through all feeding stages with a recyclable bottle that works best with the vent system in place but can be used without it as feeding develops, and is safe for use in the dishwasher (top rack only), electric and microwave sterilizers or boiling water, and BPA free