"Children who play outside are more physically active, more creative in their play, less aggressive and show better concentration." (Burdette and Whitaker, 2005; Ginsburg et al., 2007)
Research continues to teach us the positive impact that exposure to nature has on childhood development, check out the following articles to learn more:
"Connection Young Children With Nature"
"Does Nature Make Us Happy?"
"Why Get Kids Outside-Health Benefits"
"The Importance of Access to Nature for Young Children"