There's No Such Thing as Bad Weather: A Scandinavian Mom's Secrets for Raising Healthy, Resilient, and Confident Kids (from Friluftsliv to Hygge)

by Linda Åkeson McGurk

one easy way to support children’s health and strengthen their immune system could simply be to let them play outside as much as possible and not panic if they sample a clump of dirt or lick an earthworm.