This illustrates why we do need to take a precautionary approach. With respect to the life cycle of an organism, we need to be cognizant of the fact, for example, that endocrine modulation effects occur during fetal development, so what we have to do is to be protective of the mom. We can't actually put in provisions to be protective of the fetus; no, we're protective of mom. Was it enough to take bisphenol A out of baby bottles? That provision was not directed at protecting the mom, who could have elevated levels, and result in fetal exposure.
Many of our risk management measures don't actually tackle the most vulnerable windows for toxicity. That's where we need to take a more precautionary approach. I could go on in greater and obnoxious detail, but I'll keep it simple.