Sperm counts have been dropping; infant boys are developing more genital abnormalities; more girls are experiencing early puberty; and adult women appear to be suffering declining egg quality and more miscarriages. It's not just humans. Scientists report genital anomalies in a range of species, including unusually small penises in alligators, otters and minks. In some areas, significant numbers of fish, frogs and turtles have exhibited both male and female organs. Experts say the problem is a class of chemicals called endocrine disruptors, which mimic the body's hormones and thus fool our cells. This is a particular problem for fetuses as they sexually differentiate early in pregnancy. Endocrine disruptors can wreak reproductive havoc. These endocrine disruptors are everywhere: plastics, shampoos, cosmetics, cushions, pesticides, canned foods and A.T.M. receipts. They often aren't on labels and can be difficult to avoid. Chemical companies ... lobby against even safety testing of endocrine disruptors, so that we have little idea if products we use each day are damaging our bodies or our children. Still, the Endocrine Society, the Pediatric Endocrine Society, the President's Cancer Panel and the World Health Organization have all warned about endocrine disruptors, and Europe and Canada have moved to regulate them. But in the United States, Congress and the Trump administration seemed to listen more to industry lobbyists than to independent scientists.