Natural Flow Glass Baby Bottle (4 oz)
4 oz borosilicate glass baby bottle. No BPA, no BPS, no phthalates, no microplastics. Dr. Brown's glass bottles are the safest option for infant feeding.
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
Babies and young children are the most vulnerable population to chemical exposure. Their skin is more permeable, their developing organs are more susceptible to disruption, and they spend more time on floors where chemicals settle. Plastics in baby products — bottles, pacifiers, teethers, toys — are in direct contact with the most vulnerable population.
Why We Rated It This Way
Dr. Brown's glass baby bottle is the safest option for infant feeding. Borosilicate glass is completely inert — no BPA, no BPS, no phthalates, no microplastics. Infants are the most vulnerable population to chemical exposure.
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