"There are two sides to rice: the grain that feeds half the world – and the primary carcinogenic source of inorganic arsenic in our diet. Arsenic is a natural occurring element that is ubiquitous in the environment. It is present primarily as inorganic arsenic, which is highly toxic."

"As babies are rapidly growing they are at a sensitive stage of development and are known to be more susceptible to inorganic arsenic than adults. Babies and young children under five also eat around three times more food on a body weight basis than adults, which means that, relatively, they have three times greater exposures to inorganic arsenic from the same food item."

http://theconversation.com/high-levels-of-cancer-causing-arsenic-in-rice-so-why-isnt-it-regulated-in-our-food-33691