Are phthalates from plastic products found in breast milk after preterm birth?

What's actually in it

Phthalates enter the body through food stored in soft plastic containers, personal care products with fragrance, and vinyl materials. They're metabolized quickly but replaced continuously with new exposure from daily life. The mammary gland doesn't block phthalate transfer into breast milk.

Preterm infants face a double concern: they're more vulnerable to chemical exposures because their organ systems are less developed, and their NICU environment often involves plastic medical equipment that adds phthalate exposure on top of what comes through breast milk.

What the research says

A 2026 study measuring phthalate metabolites in maternal urine and breast milk after very preterm birth confirmed that phthalates appear in breast milk and that maternal phthalate body burden transfers to infants through breastfeeding. Mothers with higher urinary phthalate levels had higher levels in their milk.

Phthalates disrupt hormone signaling in ways that matter especially for premature infants whose endocrine systems are still developing. DEHP and its metabolites are particularly studied in this context because of their strong anti-androgen effects.

Reducing phthalate exposure during pregnancy and breastfeeding means switching to fragrance-free personal care products, glass or stainless steel food storage, and avoiding soft PVC products in the home.