For those who are intending to have children A recent study shows a substantial drop in IQ of children who were exposed to phthalates in the womb, and this pattern lasts at least until age 7. This is the first such study, so it may not turn out this way, but it seems worth noting, and it underscores how much low-hanging fruit there may still be in terms of environmental impacts on intelligence (similar to what happened with iodine in the 1920s and 30s).