# Baby bottles and microplastics: keep feeding safety first > What bottle experiments measured, why they do not establish a baby's dose, and where to find current preparation guidance. Canonical page: https://plasticnope.com/science/plastic-and-your-baby/ First published: 2026-05-08 · Source-checked: 2026-09-11 · Updated: 2026-09-25 Publisher: PlasticNope, a family-run guide to microplastics research (https://plasticnope.com/) ## Do baby bottles release microplastics? **Short answer:** A 2020 laboratory study found that polypropylene feeding bottles released particles under the tested preparation conditions, with more release after sterilization and with hotter water. It did not measure a baby's dose or show illness in infants. Do not change how you prepare formula or sterilize bottles because of it. Follow the formula instructions and current CDC guidance. **Particle-release research is not a reason to improvise a different formula-preparation or sterilization routine.** Follow the instructions for your formula and feeding equipment, and the advice relevant to your baby's circumstances. CDC provides current preparation guidance, including additional precautions for some infants. [CDC preparation and storage](https://www.cdc.gov/infant-toddler-nutrition/formula-feeding/preparation-and-storage.html) This article explains two laboratory studies. It does not rank feeding methods or recommend a particular bottle as a medical intervention. ## What the experiments investigated A 2020 study tested polypropylene feeding bottles during preparation-related procedures. Its abstract reports that sterilization and exposure to hotter water increased particle release under the tested conditions. The authors called for assessment of the health implications; the experiment did not demonstrate illness in infants. Our summary here is limited to the original abstract. [Li et al., 2020](https://pubmed.ncbi.nlm.nih.gov/37128027/) A separate study examined bottle systems after 100 opening-and-closing cycles. Researchers collected released material using ethanol and chemically identified only a subset of detected microparticles as plastics. Their infrared method could not identify particles below its approximately 20-micrometer threshold; electron-microscope images did not chemically confirm the smaller objects. These conditions prevent a direct calculation of normal feeding exposure or nanoplastic dose. [Song et al., methods and results](https://pmc.ncbi.nlm.nih.gov/articles/PMC8214457/) Both papers are useful starting points for better experiments. Neither is a head-to-head clinical trial showing that buying a specific current bottle improves a child's health. ## Keep the whole bottle in the decision If you are already choosing new feeding equipment, ask about the exact bottle body, collar, teat and replacement parts. Read the manufacturer's cleaning and temperature instructions for that combination. A material label for the body should not stand in for a description of the complete system. Our comparison checklist also asks whether an item fits your existing equipment, how easily it can be inspected and cleaned, and whether replacement components are available. These are purchasing questions, not a microplastic “safety score.” ## Preparation takes priority CDC advises following formula instructions, using the specified water-to-powder ratio and never microwaving a baby's bottle. Its guidance includes extra precautions for babies younger than two months, born prematurely or with weakened immune systems. Use the full guidance and ask your pediatric clinician about uncertainties specific to your child. [CDC guidance](https://www.cdc.gov/infant-toddler-nutrition/formula-feeding/preparation-and-storage.html) We will not turn an experimental particle count into a reason to feel guilty about feeding decisions. A family needs clear instructions and honest product information, not a promised “zero exposure” routine. *Updated September 11, 2026: removed the previous unsupported dose rankings, product-health promises and formula-preparation shortcut.* ## Common questions ### Should I stop sterilizing baby bottles because of microplastics? No. Particle-release research is not a reason to improvise a different preparation or sterilization routine. Follow the instructions for your formula and feeding equipment, and ask your pediatric clinician about anything specific to your child. ### Are glass baby bottles plastic-free? Not necessarily. Ask about the exact bottle body, collar, teat and replacement parts, because a material label for the body does not describe the complete system. Follow the maker's cleaning and temperature instructions for that combination. ### Can I warm a baby bottle in the microwave? No. CDC advises never microwaving a baby's bottle. It also advises following the formula instructions and using the specified water-to-powder ratio. ## Sources 1. [Li et al., Nature Food (2020): polypropylene feeding-bottle experiment, abstract](https://pubmed.ncbi.nlm.nih.gov/37128027/) 2. [Song et al., Environmental Science and Pollution Research (2021): bottle opening and closing experiment](https://pmc.ncbi.nlm.nih.gov/articles/PMC8214457/) 3. [CDC: infant formula preparation and storage, updated May 2026](https://www.cdc.gov/infant-toddler-nutrition/formula-feeding/preparation-and-storage.html) Cite the canonical page and the primary source for any scientific claim, and keep its stated limits with it.