Natural Flow Anti-Colic Glass Baby Bottles (4-Pack)
4-pack of borosilicate glass baby bottles with anti-colic vent system. No BPA, no BPS, no phthalates. Available in 4 oz and 8 oz sizes.
How scores are calculated
Materials (40%): How plastic-free the product is — raw materials, construction, and coatings.
Packaging (20%): Is the product packaged in plastic? Is it recyclable?
Transparency (20%): Does the brand disclose ingredients, sourcing, and manufacturing?
Durability (20%): How long does it last? Longer-lasting products reduce plastic waste over time.
This is a rating of this specific product only — not the company. Other products from this brand may score differently.
Last updated: April 6, 2026
Infants and toddlers are uniquely vulnerable to chemical exposure. Their bodies are still developing, their detoxification systems are immature, and they spend more time on floors and put objects in their mouths. Pound-for-pound, children receive higher doses of environmental chemicals than adults from the same products.
Why We Rated It This Way
Glass baby bottles are the safest choice for feeding infants. Dr. Brown's glass bottles combine the safety of borosilicate glass with their proven anti-colic vent system. The polypropylene vent components are BPA-free.
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