Article:How to Talk About Strangers

You're always happy to see your child bound up to another kid on the playground and make a new pal. But it's a little unnerving when your preschooler approaches an adult he doesn't know and starts chatting away. "Social skills and independence blossom at ages 4 and 5," says Charles Shubin, MD, associate professor of pediatrics at the University of Maryland in Baltimore. "Even a kid who used to hide behind your leg six months ago may now feel comfortable engaging anybody and everybody she meets."

http://www.parents.com/kids/safety/stranger-safety/rules-for-stranger-safety/