Prenatal Phenol and Phthalate Exposures and Birth Outcomes

BackgroundMany phthalates and phenols are hormonally active and are suspected to alter the course of development.ObjectiveWe investigated prenatal exposures to phthalate and phenol metabolites and their associations with body size measures of the infants at birth.MethodsWe measured 5 phenol and 10 phthalate urinary metabolites in a multiethnic cohort of 404 women in New York City during their third trimester of pregnancy and recorded size of infants at birth.ResultsMedian urinary concentrations were > 10 μg/L for 2 of 5 phenols and 6 of 10 phthalate monoester metabolites. Concentrations of low-molecular-weight phthalate monoesters (low-MWP) were approximately 5-fold greater than those of high-molecular-weight metabolites. Low-MWP metabolites had a positive association with gestational age [0.97 day gestational age per ln-biomarker; 95% confidence interval (CI), 0.07–1.9 days, multivariate adjusted] and with head circumference. Higher prenatal exposures to 2,5-dichlorophenol (2,5-DCP) predicted lower birth...