atypical of its gender. Urinary BPA values later in pregnancy showed no link to behavior, Braun says, suggesting that the window of vulnerability to BPA’s neurological impacts may be very early. Perhaps even before some women recognize they’re pregnant.
The girls appeared somewhat masculinized, the boys a bit feminized. Then again, Braun points out, it’s possible the girls’ behavior reflected a defeminization or the boys a demasculinization. In other words, the production or action of their gender-establishing sex hormones.might have been blocked.
Girls whose mothers had the highest BPA exposures in early pregnancy tended to score high on the “externalizing” component of a test known as BASC-2, for Behavioral Assessment System for Children-2. It’s geared to young children and evaluates their tendency towards aggression and hyperactivity. Boys with the highest womb exposures to BPA tended to exhibit an increased “internalizing” BASC score. They were more likely to “be withdrawn or show depressive symptoms, or maybe complain about aches and pains – which is often a manifestation of anxiety,” Braun explains.
The trend towards a behavioral deviation from the norm in all of these kids was small, Braun says, perhaps 2 to 6 points (as measured on about a 100-point scale) for each 10-fold increase in mom’s urinary BPA.
That’s a magnitude of change similar to the subtle IQ drops attributable to environmental lead exposures in U.S. children, notes Lanphear. Yet when extrapolated across a population, the societal cost of those tiny
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