Dr. Brown's Natural Flow Anti-Colic Options+ Narrow Glass Baby Bottles, 8oz and 4oz, 4-Pack Review (2026)

Who this set is for

This four pack mixes two 4oz bottles and two 8oz bottles, which covers a newborn's smaller early feeds and gives room to grow into larger feeds later without buying a second set of bottles in a different size. It suits parents who specifically want glass rather than plastic touching their baby's milk, whether for durability, easier cleaning visibility, or personal preference around plastic contact, since Dr. Brown's sells the same internal vent system in both materials. The bottles are labeled for use from birth, or 0 months and up, and ship with a Level 1 slow flow nipple appropriate for that early stage.

How the vent system works

The core feature across Dr. Brown's Natural Flow and Options+ lines is an internal vent system, which the company states is clinically proven to reduce colic symptoms by decreasing the vacuum that forms as a baby feeds. Dr. Brown's describes this as helping to reduce spit-up, burping, and gas compared with a standard vent-free bottle, and the nipple has a breast-like shape intended to support a proper latch, which can help babies move between breast and bottle feeding more easily. The Options+ update to the vent lets parents use the internal vent insert for maximum venting or remove it for a more streamlined bottle as the baby grows and needs it less.

Glass care and everyday handling

Being glass, these bottles are heat and thermal shock resistant according to the manufacturer, meaning they can go from a cold fridge to a hot bottle warmer or boiling water sterilizer without the sudden temperature swings that can crack lesser glass. They are dishwasher safe on the top rack and can also go through electric or microwave sterilizers or plain boiling water. The obvious trade-off with glass is weight and breakage risk, since a dropped glass bottle on a tile or hardwood floor is more likely to shatter than a silicone or plastic one, which is worth considering for use around toddlers or on the go.

How it compares with silicone alternatives

Against Comotomo's silicone bottles, which rank ahead of this set in our guide, the main difference is material feel and part count. Comotomo's wide-neck silicone body is lighter and shatterproof, with a simpler dual-vent system built into the collar, while Dr. Brown's internal vent uses a separate insert and reservoir piece that adds a couple of extra parts to wash after every feed. What Dr. Brown's offers in return is glass that many parents trust to stay stain and odor free over years of repeated use, plus the flexibility of the Options+ vent system that can be simplified once colic symptoms improve.

Verdict and who should choose differently

For parents who want glass bottles specifically, and who like having both 4oz and 8oz sizes on hand from day one, this set is a well-built option backed by a vent system Dr. Brown's has offered for years. Families worried about breakage around active toddlers, or who prefer fewer parts to wash after each feed, may be better served by a silicone bottle such as Comotomo instead. For a newborn just coming home, the mixed sizing in this four pack means you are not stuck reordering a second size within the first couple of months of feeding.

Frequently asked questions