Overview
- The study published in JAMA Network Open in mid-June 2026 analyzed more than 5,000 mother–child pairs born from 2000 to 2021 and tested maternal urine for 113 chemicals.
- Researchers found an average of 45 chemicals per urine sample and identified phthalates, replacement plasticizers, polycyclic aromatic hydrocarbons (PAHs) and halogenated phenols as linked to earlier delivery or lower birthweight.
- The analysis showed many replacement chemicals introduced to substitute banned substances produced similar associations with earlier births and lower birthweight, illustrating recurring 'regrettable substitutions'.
- Authors and institutions backed by the NIH ECHO program called for systemic reforms including class-based regulation, premarket safety proofing, and better hazard and exposure data to protect pregnant people.
- Stanford announced a new program to close chemical data gaps and translate the study evidence into policy solutions, responding to researchers' warnings that U.S. oversight has fully assessed only a tiny fraction of the roughly 40,000 chemicals on the market.