# Baby bottle sizes compared by capacity Which baby bottle in this set has the greatest capacity, and how do the other sizes compare? 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\. Dr\. Brown's Natural Flow® Anti\-Colic Options\+™ Narrow Baby Bottle: The product is Dr\. Brown's Natural Flow Anti\-Colic Options\+ Narrow Baby Bottle with Level 1 Slow Flow Nipple, 8 oz/250 mL\. 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\. ### 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\. - 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) - Colic claim: 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\+™ Narrow Baby Bottle](/products/ucp/drbrownsbaby-com/9139832193301) (sold by drbrownsbaby\.com) The product is Dr\. Brown's Natural Flow Anti\-Colic Options\+ Narrow Baby Bottle with Level 1 Slow Flow Nipple, 8 oz/250 mL\. - Capacity: The product is Dr\. Brown's Natural Flow Anti\-Colic Options\+ Narrow Baby Bottle with Level 1 Slow Flow Nipple, 8 oz/250 mL\. (guide) - Colic claim: The internal vent system is clinically proven to reduce colic and helps reduce spit\-up, burping, and gas\. (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\. - 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) - Colic claim: The anti\-colic internal vent system is clinically proven to reduce colic and helps reduce spit\-up, burping and gas\. (listing) 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\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-12T05:46:57.825Z. This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. The person approves the total; once RoboTrunk has checked the store's total against it, the person is given the checkout link to tap in their own browser, or, if the person prefers and gives permission, their agent may open the link and finish there, and payment always happens on the store's own checkout page. RoboTrunk never takes the payment or sees a card. Where the rest of this site is: - /agent/story.md is what RoboTrunk is and how it works, in full. - /agent/tools.json is every tool, its arguments and its answers. - /agent/merchants is every store you can buy from through RoboTrunk. - /products/ucp is every store's indexed products. - /products/search is one search across every store, in plain words. - [What RoboTrunk is](/agent/story.md) - [Every tool, in your browser through WebMCP](/agent) - [The tools and how to call them](/agent/tools.json) - [The stores you can buy from](/agent/merchants) - [Every store's products](/products/ucp) - [Search every store at once](/products/search)