Does Glass baby bottle have microplastics?
The short answer
Almost nothing from the bottle. Glass is unaffected by the hot-water step that drives release from polypropylene, which is precisely the mechanism the Nature Food study identified. The silicone teat remains, and it is a much smaller contact surface.
Why Glass baby bottle scores 15
Glass does not degrade at formula-preparation or sterilisation temperatures
The silicone teat is the only polymer, and it is in the baby’s mouth rather than holding hot water
Heavier and breakable, which is why most brands sell a silicone sleeve — that sits outside the glass
Sterilises identically, so no routine change is required
Where the 15 comes from
Five components, added. The page renders the parts rather than a stored total, so the number cannot disagree with the reasoning behind it.
- Packaging contact
- 3 / 30
- Use conditions
- 6 / 25
- Measured release
- 4 / 25
- Polymer behaviour
- 2 / 10
- Processing
- 0 / 10
What material touches the contents, over how much surface area, for how long. Glass and steel score near zero here; a film pressed against fatty food scores near the top.
Heat, abrasion, flexing, repeated opening, reuse beyond design life. The same bottle scores differently in a fridge and in a hot car.
What a laboratory actually counted, for this product or its category. A high number here means real particles were measured, not that the material looks suspicious.
How this specific polymer behaves — brittleness, fat solubility of its additives, thermal stability, whether it is a polymer named in existing restrictions.
What happened before you bought it. Retort sterilisation inside the pack, hot-filling, and pressurised brewing all happen at the most migration-favourable moment.
What we don't know
Silicone teats have not been measured for particle release, and they are heated repeatedly during sterilisation. Silicone is generally regarded as more thermally stable than polypropylene; that is a materials-science expectation and not a study of teats.
This section is on every page in the database, including the ones where the answer is comfortable. How evidence grades work →
Better options
Ordered by how much they change, not by how much they cost.
Already the strongest option in this category
replace teats when they go cloudy or tacky
Check the one in your nursery
This page scores Glass baby bottle as a product. Formulations, packaging and suppliers change, and the specific item you own has its own condition — a scratched pan and a new one are not the same object. Scan yours for a score built from what is actually in front of you.
Scan my baby & toddlerSources behind this score
Each with the finding we use it for and the limitation that finding carries — because a study quoted without its boundaries is how this subject got so noisy.
- peer-reviewed2020
Li 2020 (Nature Food) — Polypropylene infant bottles prepared to WHO sterilisation guidance released 1.3–16.2 million microplastic particles per litre of formula.
Limitation: Release scaled with water temperature — the highest numbers came from the 70°C step WHO recommends for killing bacteria. The study explicitly did not recommend abandoning that step, and no health outcome was measured.
- peer-reviewed2018
Schymanski 2018 — Compared formats head to head: single-use PET averaged 14 particles/L, returnable PET 118/L, glass bottles 50/L and beverage cartons 11/L.
Limitation: The glass result is the one people skip. Glass was not zero — particles came from the cap and the filling line, not the bottle wall. Small sample per format.