Can phthalates and DINCH end up in breast milk?
Yes. A 2026 pilot biomonitoring study detected phthalate and DINCH metabolites in paired urine and breast milk samples from lactating mothers.
What they are
Phthalates are plasticizers used to make some plastics softer. DINCH is a replacement plasticizer used in some products. Exposure can come from soft plastic, vinyl, some personal care products, food packaging, and indoor dust.
This page is not a warning against breastfeeding. Breastfeeding has major benefits. The practical goal is to lower avoidable plasticizer exposure around nursing families.
What the study found
A 2026 study in Ecotoxicology and Environmental Safety measured 14 phthalate metabolites and 3 DINCH metabolites in paired urine and breast milk samples from 30 lactating mothers.
The study found phthalate and DINCH metabolites in both urine and maternal milk, with medians ranging from below the lower limit of quantification to 16 micrograms per liter in milk. The authors also noted that breast milk testing still needs better standard protocols and reference materials.
This was a small pilot study. It shows that these chemicals can be measured in breast milk, not that one baby product is the only source.
What to do
Reduce soft vinyl and mystery plastic around babies when you can. Choose glass, stainless steel, wood, organic cotton, or clearly labeled silicone for high-use items.
For toys, skip soft plastic with a strong smell. Pick simple wood toys or washable cloth toys when they fit your baby's age and safety needs.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Quantification of phthalate and DINCH metabolites in human urine and maternal breast milk: Assessing maternal body burden and infant exposure | Ecotoxicol Environ Saf | 2026 |