SEATTLE — A recent peer-reviewed study analyzing 50 breast milk samples from mothers in Seattle found that approximately 92% of them contained at least one antimicrobial or plasticizer. Researchers checked for specific compounds within these categories.

About 92% of the samples contained melamine. The study detected triclosan in 62% of the samples. BPA was present in 74% of samples, while BPS was found in 78% of the samples. The study also identified cyanuric acid in breast milk samples, and previous analyses of these same samples had indicated the presence of PFAS and flame retardants.

Ryan Babadi, a senior scientist with the Toxic Free Future nonprofit and a lead author of the study, noted concerns regarding the detected substances. Babadi said, "The cocktail of endocrine-disrupting chemicals is concerning for a number of reasons." He added, "This pertains to the most vulnerable group when it comes to health effects – infants and children – who are undergoing rapid stages of development that are orchestrated by the endocrine system." Babadi also stated, "While taking steps like not buying plastic can help mothers avoid the chemicals, the compounds are so ubiquitous in consumer goods that people cannot shop their way out of this."

The study's participants were mothers who generally had higher education and income levels. Some of the compounds detected in the study were present at levels below the World Health Organization's tolerable daily intake. Past epidemiological studies have linked BPS with lower weight in young children and associated BPA with impaired neurodevelopment, asthma, and obesity. Additionally, limited studies have connected exposure to mixtures of endocrine-disrupting chemicals with lower birth weight and size. Triclosan, an antimicrobial found in the study, is used in some personal care products.