Can phthalate exposure during pregnancy alter a newborn's metabolism and brain development?

What's actually in it

Phthalates enter pregnant people through food packaging, personal care products with fragrance, flexible vinyl products, and some medical equipment. They cross the placenta and alter gene expression and metabolism in fetal tissue during development.

A metabolome is the full collection of small molecules (like amino acids, lipids, and hormones) circulating in the body at any given moment. It's a snapshot of how well the body's biochemistry is running. When toxicants alter fetal metabolism, those changes show up in the newborn's metabolome at birth.

What the research says

A 2025 study in Nat Commun measured phthalate metabolites in pregnant women's urine, then analyzed cord blood metabolomes at birth, and tracked infant neurodevelopment through the first year. Higher prenatal phthalate exposure was associated with specific metabolomic disruptions at birth, particularly in amino acid and lipid pathways. These same disrupted metabolic patterns predicted lower neurodevelopmental scores in the infants at follow-up.

The metabolome findings bridge the gap between chemical exposure and developmental outcome: they show the biochemical pathway from phthalate exposure to the brain development effects seen in the babies. Disrupted amino acid metabolism affects how neurons synthesize proteins. Disrupted lipid metabolism affects how myelin (the insulation on nerve fibers) forms.

This study is notable because it used Nature Communications-level evidence: a well-designed cohort with biological measurements at multiple stages showing a chain of effect. The phthalate-metabolome-neurodevelopment link is now mechanistically supported, not just correlational.