Children in kindergarten or even younger are forming cliques and "using the threat of removing friendship as a tactical weapon," according to The Wall Street Journal.

"Though both boys and girls exhibit relational aggression, it is thought to be more common among girls because they are generally more socially developed and verbal than boys," The Wall Street Journal reported.

Children also seem to be exhibiting relational aggression at younger ages. 

"I think it's remarkable that we're seeing this at younger and younger ages," Laura Barbour, a school counselor, told The Wall Street Journal. "Kids forget about scuffles on the playground but they don't forget about unkind words or being left out." 

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Article by Navindra Persaud, EducationWorld Contributor