Forever Chemicals, Lasting Effects: Prenatal PFAS Exposure Shapes Baby Immunity

Wednesday, July 23, 2025

New research reveals that tiny amounts of PFAS—widely known as “forever chemicals”—cross the placenta and breast milk to alter infants’ developing immune systems, potentially leaving lasting imprints on their ability to fight disease.

University of Rochester Medical Center (URMC) researchers tracked 200 local healthy mother–baby pairs, measuring common PFAS compounds in maternal blood during pregnancy and then profiling infants’ key T‑cell populations at birth, six months, and one year. By age 12 months, babies whose mothers had higher prenatal PFAS exposure exhibited significantly fewer T follicular helper (Tfh) cells—vital coaches that help B cells produce strong, long‑lasting antibodies—and disproportionately more Th2, Th1, and regulatory T cells (Tregs), each linked to allergies, autoimmunity, or immune suppression when out of balance.

“This is the first study to identify changes in specific immune cells that are in the process of developing at the time of PFAS exposure,” said Kristin Scheible, MD, an associate professor of Pediatrics and Microbiology & Immunology at URMC and lead author of the study, which appears in the journal Environmental Health Perspectives. “Identification of these particular cells and pathways opens up the potential for early monitoring or mitigation strategies for the effects of PFAS exposure, in order to prevent lifelong diseases.”

What Experts Want You to Know About Microplastics

Tuesday, May 20, 2025

Microbiologist Jacques Robert, PhD, told The New York Times (May 20) that his research shows tadpoles excreted about 60 percent to 70 percent of the microplastics they were fed. His studies also suggest that microplastics may weaken the immune system. While animal studies don’t always translate directly to humans, other research indicates that microplastics not excreted can enter the bloodstream and migrate to organs like the liver and brain.