Common 'Forever Chemical' Found to Disrupt How a Baby's Face Forms in the Womb

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A Chemical Hiding in Plain Sight

Perfluorodecanoic acid, or PFDA, belongs to a family of synthetic chemicals known as PFAS. These substances are prized by manufacturers because they resist heat, water, and grease. That is why they turn up in nonstick pans, waterproof jackets, and greaseproof food wrappers.

The same properties that make PFAS useful also make them dangerous. Their chemical bonds barely break down in nature or in the human body, earning them the nickname "forever chemicals." Traces of PFAS have already been found in the blood of most people worldwide.

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From Suspicion to Proof

Researchers have long suspected a link between PFAS exposure and birth defects affecting the face and skull. Until now, nobody could explain exactly how these chemicals caused the damage.

A new study from the University of Colorado Anschutz Medical Campus has closed that gap. Published in the peer-reviewed journal ACS Chemical Research in Toxicology, the research team tested 13 common PFAS chemicals and identified PFDA as the most harmful to facial development in early pregnancy.

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How PFDA Attacks the Body's Building Plan

The key lies in a molecule called retinoic acid, which is made from vitamin A. During early pregnancy, retinoic acid acts like a construction supervisor, directing hundreds of genes that shape the face and skull. Too much or too little of it can throw the whole building plan off course.

A developing fetus cannot make or clear this molecule on its own. It relies entirely on the mother's liver to keep retinoic acid levels balanced. Normally, an enzyme called CYP26A1 breaks down any excess.

The study found that PFDA blocks this enzyme directly. On top of that, PFDA also suppresses the gene that produces the enzyme in the first place. Researchers describe this as a "double hit" that lets retinoic acid build up to harmful levels.

In laboratory tests on zebrafish, even very small amounts of PFDA raised the risk of facial abnormalities by ten percent compared to unexposed animals. Craniofacial defects already account for roughly one in three birth defects worldwide, making the discovery especially significant.

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Why This Discovery Matters

Senior author Jed Lampe, an associate professor at the university's Skaggs School of Pharmacy, said the finding shifts the conversation from a loose association to a clear biological explanation. Knowing the exact mechanism allows scientists to test other PFAS chemicals for the same risk, rather than treating all 15,000 known PFAS as equally dangerous.

This distinction matters for regulators and manufacturers alike. Faster, cheaper laboratory tests could eventually screen new chemicals before they ever reach consumer products, rather than discovering the danger decades later.

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What Pregnant Women Can Do Now

Most people absorb only small amounts of PFAS through daily life. Exposure rises sharply for people who live near manufacturing sites, drink contaminated water, or work in jobs such as firefighting, where PFAS-based foams are common.

Simple precautions can lower everyday exposure. Avoiding nonstick cookware, skipping greaseproof fast-food packaging, using a water filter certified for PFAS removal, and choosing furniture or clothing not marketed as stain-resistant can all help reduce contact with these chemicals.

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Regulatory Outlook

The discovery arrives as U.S. regulators reassess how strictly to police PFAS in drinking water. In May 2026, the Environmental Protection Agency under the Trump administration proposed keeping the strict limit of 4 parts per trillion for two of the most studied PFAS chemicals, PFOA and PFOS, while giving water utilities extra time until 2031 to comply. The agency also proposed lifting limits on four less-studied PFAS compounds, arguing the previous rules were adopted without following required legal procedure.

The EPA says it remains committed to tackling PFAS contamination and has pledged close to a billion dollars to help states upgrade water treatment. Public comments on the proposed rules are open until July 20, 2026, with a hearing scheduled for July 7.

Findings like the one from CU Anschutz are likely to feed directly into that debate, giving regulators sharper tools to decide which of the thousands of PFAS chemicals in use truly deserve strict oversight — and which pose limited risk.

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Sources

1. University of Colorado Anschutz Medical Campus – News Release: https://news.cuanschutz.edu/news-stories/how-one-forever-chemical-can-disrupt-a-babys-facial-development
2. EurekAlert! (AAAS) – Press Release: https://www.eurekalert.org/news-releases/1121996
3. Hvizdak, M., Kandel, S. E., Lampe, J. N. — "New Mechanistic Evidence for Perfluorodecanoic Acid (PFDA) Teratogenicity via CYP26A1-Mediated Retinoic Acid Metabolism and Signaling," Chemical Research in Toxicology, 2026 (peer-reviewed original study): https://pmc.ncbi.nlm.nih.gov/articles/PMC13100982/
4. U.S. Environmental Protection Agency – "EPA Advances Comprehensive PFAS Strategy with Legally Defensible, Practical, Scientifically Sound Drinking Water Protections" (May 18, 2026): https://www.epa.gov/newsreleases/epa-advances-comprehensive-pfas-strategy-legally-defensible-practical-scientifically
5. U.S. Environmental Protection Agency – "Proposed PFAS Rescission Rule": https://www.epa.gov/sdwa/proposed-pfas-rescission-rule

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