Is it safe to use hand-me-down plastic baby bottles?
No. Plastic bottles break down over time, and research shows that plastic additives can leach into products, posing risks to your baby.
What's actually in it
Plastic isn't a solid, stable material. It is a mix of polymers and chemical additives designed to make the plastic flexible, clear, or durable. Over time, these additives don't just stay inside the plastic. They leach out.
When you reuse old plastic bottles, you are exposing your baby to these chemicals. This is especially true as the plastic gets older and starts to break down from heat, washing, and general wear. You cannot see these chemicals, but they are there.
What the research says
A 2026 study in Environ Int looked at plastic additives in products used for babies. The research found that these additives are common and can move from the plastic into the product. This peer-reviewed study confirms that plastic is not a safe or inert material for your baby to interact with.
Because plastic degrades, the older the bottle, the more likely it is that these additives will leach into your baby's milk or formula. Don't risk your baby's health by reusing old plastic containers.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Suspect screening of plastic additives in baby skincare products. | Environ Int | 2026 |
What to use instead
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