Study of mothers in Seattle underscores ‘widespread, systemic problem’ of chemical contamination, experts say Breast milk samples from mothers in Seattle contain alarming levels of dangerous hormone-disrupting chemicals, including BPA, BPS, melamine, cyanuric acid, and triclosan, new peer-reviewed research has found. The chemicals present a serious risk to infants because they likely interfere with hormones that are critical to newborns’ proper development, and have been found to be harmful at v