By Saundra Young, CNN
February 17, 2014 — Updated 2126 GMT (0526 HKT)
The biggest window of vulnerability to chemicals occurs in utero, during infancy and early childhood, experts say.

(CNN) — The number of chemicals known to be toxic to children’s developing brains has doubled over the last seven years, researchers said.

Dr. Philip Landrigan at Mount Sinai School of Medicine in New York and Dr. Philippe Grandjean from Harvard School of Public Health in Boston, authors of the review published Friday in The Lancet Neurology journal, say the news is so troubling they are calling for a worldwide overhaul of the regulatory process in order to protect children’s brains.

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