Can prenatal PFAS exposure affect a child's cognitive development and IQ trajectory?

What's actually in it

PFAS accumulate in maternal blood and cross the placenta throughout pregnancy. The fetal brain is developing rapidly throughout the entire pregnancy and is sensitive to hormone disruption at every stage. PFAS disrupt thyroid hormones, sex hormones, and immune signaling, all of which are involved in normal brain development.

Research on PFAS and brain development goes back nearly 20 years, starting with studies in the Faroe Islands where fish consumption led to high PFAS exposure. The consistent finding: more prenatal PFAS, lower cognitive scores in children.

What the research says

A 2026 longitudinal study on prenatal PFAS exposure and neurodevelopmental trajectories followed children from gestation through school age and found that higher prenatal PFAS levels were associated with lower scores on cognitive tests and disrupted developmental milestones. The effects were present across multiple PFAS compounds and were stronger in children with higher total PFAS exposure.

The review found no PFAS exposure level at which there was clearly no cognitive effect. Lower PFAS exposure was consistently associated with better developmental outcomes.

Reducing prenatal PFAS exposure is the most direct actionable strategy: replace nonstick cookware with cast iron or stainless steel, avoid PFAS-treated food packaging, and filter drinking water. These changes reduce the ongoing PFAS intake that accumulates over pregnancy.