Why thumb sucking might be a good thing! –

A new study suggests that those habits in children ages 5 to 11 may indeed increase exposure to microbes, but that that may not be all bad. In a study published Monday in the journal Pediatrics, researchers drew evidence from an ongoing study of New Zealand children to show those whose parents described them as thumb-suckers and nail-biters were less likely to have positive allergic skin tests later in life.

Source: Thumb Suckers and Nail Biters May Develop Fewer Allergies – The New York Times