The Huffington Post Blog, by: Christine Gross-Loh 07-May-2013 
.....The parent I used to be and the parent I am now both have the same goal: to raise self-reliant, self-assured, successful children. But 12 years of parenting, over five years of living on and off in Japan, two years of research, investigative trips to Europe and Asia and dozens of interviews with psychologists, child development experts, sociologists, educators, administrators and parents in Japan, Korea, China, Finland, Germany, Sweden, France, Spain, Brazil and elsewhere have taught me that though parents around the world have the same goals, American parents like me (despite our very best intentions) have gotten it all backwards.
We need to let 3-year-olds climb trees and 5-year-olds use knives.
Imagine my surprise when I came across a kindergartener in the German forest whittling away on a stick with a penknife. His teacher, Wolfgang, lightheartedly dismissed my concern: "No one's ever lost a finger!"
Similarly, Brittany, an American mom, was stunned when she moved her young family to Sweden and saw 3- and 4-year-olds with no adult supervision bicycling down the street, climbing the roofs of playhouses and scaling tall trees with no adult supervision. The first time she saw a 3-year-old high up in a tree at preschool, she started searching for the teacher to let her know. Then she saw another parent stop and chat with one of the little tree occupants, completely unfazed. It was clear that no one but Brittany was concerned.
"I think of myself as an open-minded parent," she confided to me, "and yet here I was, wanting to tell a child to come down from a tree."
Why it's better: Ellen Hansen Sandseter, a Norwegian researcher at Queen Maud University in Norway, has found in her research that the relaxed approach to risk-taking and safety actually keeps our children safer by honing their judgment about what they're capable of. Children are drawn to the things we parents fear: high places, water, wandering far away, dangerous sharp tools. Our instinct is to keep them safe by childproofing their lives. But "the most important safety protection you can give a child," Sandseter explained when we talked, "is to let them take... risks."
Consider the facts to back up her assertion: Sweden, where children are given this kind of ample freedom to explore (while at the same time benefitting from comprehensive laws that protect their rights and safety), has the lowest rates of child injury in the world....