This isn't the first time I've studied fire retardants and children. A few years ago I documented the presence of these persistent and toxic chemicals in people. Used to slow the ignition of polyurethane foam (which is pretty flammable), these substances (known as polybrominated diethyl ethers or PBDEs) were taken off the U.S. market in 2006 because they were shown to be toxic to lab animals and, ultimately, to people. Studies by EWG and others confirmed that they were in the bodies of every American. We even found them in umbilical cord blood, which supplies nutrients - and in this case toxic fire retardants - to the developing fetus.