Industrial waste poisoning may have developmental effects on unborn children. There are 30 chemicals listed by the federal government that may cause problems for women who are pregnant and become exposed to toxic substances. Depending on the chemical and length of exposure, a pregnant woman's unborn baby may need to be considered while treating the mother for poisoning. And while many chemicals, such as benzene and hydrogen cyanide, adversely affect adults, research regarding how they affect pregnancy and unborn babies has been inconclusive. However, medical counseling is recommended for women exposed to toxins while pregnant.