# Dr\. Brown's Glass Baby Bottles: Capacity, Nipple and Vent System Which Dr\. Brown's baby bottles are made of glass, and what are their capacities, nipples, and vent systems? Dr\. Brown's Natural Flow Anti\-Colic Options\+ Wide\-Neck Glass Baby Bottle: The listed product is Dr\. Brown's Natural Flow Anti\-Colic Options\+ Wide\-Neck baby bottle with Level 1 slow flow nipple, 9 oz/270 mL, SKU WB91700, from Dr\. Brown's\. The catalogue says the glass material is linked to easier cleaning and deeper hygiene, and that the bottle does not absorb odours, flavours or colours from food\. The breast\-like nipple shape is designed to encourage a proper latch for a more natural bottle\-feeding experience\. The internal vent system is described as clinically proven to reduce colic and to help reduce spit\-up, burping and gas\. Dr\. Brown's Natural Flow® Anti\-Colic Options\+™ Glass Narrow Baby Bottle: The product is Dr\. Brown's Natural Flow Anti\-Colic Options\+ Glass Narrow Baby Bottle with Level 1 Slow Flow Nipple, 4 oz/120 mL, 1\-Pack, SKU SB41001, sold as Default Title\. Vacuum\-free feeding is described as closest to breastfeeding, with silicone nipples providing consistent flow so baby can feed at their own pace\. Internal vent system is proven to help preserve bottle milk nutrients and aids in digestion for a better night’s sleep\. Dr\. Brown's Natural Flow Anti\-Colic Options\+ Wide\-Neck Baby Bottle: This is a Dr\. Brown's Natural Flow Anti\-Colic Options\+ wide\-neck baby bottle in glass, 5oz/150mL, with a Level 1 slow\-flow nipple\. The nipple is high\-grade soft silicone with a contoured breast\-like shape, designed alongside medical professionals to help avoid nipple confusion\. The enhanced internal vent system is described as improving an already innovative feeding experience on the fully\-vented bottle\. ### 1. [Dr\. Brown's Natural Flow Anti\-Colic Options\+ Wide\-Neck Glass Baby Bottle](/products/ucp/drbrownsbaby-com/9139832848661) (sold by drbrownsbaby\.com) The listed product is Dr\. Brown's Natural Flow Anti\-Colic Options\+ Wide\-Neck baby bottle with Level 1 slow flow nipple, 9 oz/270 mL, SKU WB91700, from Dr\. Brown's\. - Glass: The catalogue says the glass material is linked to easier cleaning and deeper hygiene, and that the bottle does not absorb odours, flavours or colours from food\. (manual) - Capacity: The listed product is Dr\. Brown's Natural Flow Anti\-Colic Options\+ Wide\-Neck baby bottle with Level 1 slow flow nipple, 9 oz/270 mL, SKU WB91700, from Dr\. Brown's\. (listing) - Nipple: The breast\-like nipple shape is designed to encourage a proper latch for a more natural bottle\-feeding experience\. (guide) - Vent system: The internal vent system is described as clinically proven to reduce colic and to help reduce spit\-up, burping and gas\. (listing) ### 2. [Dr\. Brown's Natural Flow® Anti\-Colic Options\+™ Glass Narrow Baby Bottle](/products/ucp/drbrownsbaby-com/9139832160533) (sold by drbrownsbaby\.com) Internal vent system is proven to help preserve bottle milk nutrients and aids in digestion for a better night’s sleep\. - Glass: - - Capacity: The product is Dr\. Brown's Natural Flow Anti\-Colic Options\+ Glass Narrow Baby Bottle with Level 1 Slow Flow Nipple, 4 oz/120 mL, 1\-Pack, SKU SB41001, sold as Default Title\. (listing) - Nipple: Vacuum\-free feeding is described as closest to breastfeeding, with silicone nipples providing consistent flow so baby can feed at their own pace\. (guide) - Vent system: Internal vent system is proven to help preserve bottle milk nutrients and aids in digestion for a better night’s sleep\. (guide) ### 3. [Dr\. Brown's Natural Flow Anti\-Colic Options\+ Wide\-Neck Baby Bottle](/products/ucp/drbrownsbaby-com/9139832979733) (sold by drbrownsbaby\.com) This is a Dr\. Brown's Natural Flow Anti\-Colic Options\+ wide\-neck baby bottle in glass, 5oz/150mL, with a Level 1 slow\-flow nipple\. - Glass: This is a Dr\. Brown's Natural Flow Anti\-Colic Options\+ wide\-neck baby bottle in glass, 5oz/150mL, with a Level 1 slow\-flow nipple\. (listing) - Capacity: This is a Dr\. Brown's Natural Flow Anti\-Colic Options\+ wide\-neck baby bottle in glass, 5oz/150mL, with a Level 1 slow\-flow nipple\. (listing) - Nipple: The nipple is high\-grade soft silicone with a contoured breast\-like shape, designed alongside medical professionals to help avoid nipple confusion\. (guide) - Vent system: The enhanced internal vent system is described as improving an already innovative feeding experience on the fully\-vented bottle\. (guide) Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. 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