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The ‘dirt’ on thumb-sucking

Your thumb-sucking granddaughter or grandson may just be doing the right thing, says the Association of Mature American Citizens.

A new study suggests that the normally frowned-upon activity may help them resist certain allergies.

Professor Malcolm Sears of Canada’s McMaster University School of Medicine says that “early exposure to dirt is not a bad thing. When [children] suck their thumbs or bite their nails, they’re exposing themselves to additional microbes or dirt which is stimulating the immune system.”