Do phthalates in plastic products increase the risk of preterm birth?
Yes. Multiple studies have linked higher phthalate levels in pregnant women to increased odds of preterm birth. The connection is strongest for certain phthalate compounds found in soft plastics.
What's actually in it
Phthalates are plasticizers added to PVC and other soft plastics to keep them flexible. They're also used in fragrance compounds in shampoos, lotions, and cleaning products. Common sources include soft plastic shower curtains, vinyl flooring, personal care products with "fragrance," and soft plastic food packaging.
Phthalates don't stay bound in the material. They off-gas and migrate out continuously. Pregnant women who live and work in environments with high phthalate exposure have higher urinary phthalate levels, which reflects body burden.
What the research says
A 2026 study examining pregnancy phthalate exposure found that higher concentrations of individual phthalates and their mixtures during pregnancy were associated with increased preterm birth risk. Certain compounds, including DEHP metabolites, showed stronger associations.
Phthalates are thought to trigger preterm birth by disrupting prostaglandin pathways, which control uterine contractions, and by affecting estrogen and progesterone signaling critical for maintaining pregnancy.
Using glass or stainless steel food containers, choosing fragrance-free personal care products, and avoiding soft vinyl products during pregnancy are the most direct ways to reduce phthalate exposure.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Pregnancy exposure to individual phthalate concentrations and their mixtures in association with preterm birth | Environ Health Perspect | 2026 |
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