A large study published on June 17, 2026, led by researchers at the UNC Gillings School of Global Public Health, Stanford University School of Medicine, and the Woods Institute for the Environment, found that exposure to common chemicals during pregnancy is linked to preterm birth and lower birthweight. The study analyzed data from over 5,000 pregnant women across the United States, measuring levels of dozens of chemicals in urine and blood samples.
The chemicals studied included phthalates (found in plastics and personal care products), bisphenols (such as BPA in food containers), and pesticides. The researchers found that higher exposure levels were associated with a 10-15% increased risk of preterm birth and an average reduction in birthweight of 50-100 grams. The findings were adjusted for factors like maternal age, smoking, and socioeconomic status.
Dr. Emily Barrett, a co-author from Rutgers University, said in a statement: 'This is one of the most comprehensive looks at how everyday chemical mixtures affect pregnancy outcomes. It underscores the need for stronger regulations and public health guidance.' The study was published in the journal Environmental Health Perspectives.
Experts not involved in the research noted that while the study shows a strong association, it does not prove causation. However, they emphasized that reducing exposure to these chemicals during pregnancy is a prudent precaution. The American College of Obstetricians and Gynecologists recommends avoiding plastic food containers, choosing fragrance-free products, and washing fruits and vegetables thoroughly.
