More than a third of U.S. kids were physically assaulted in an 8-month period

That's according to the latest National Survey of Children's Exposure to Violence. Nearly 22 percent of those assaults came at the hands of siblings, while 16 percent involved peers and 15 percent involved caregivers.

"The issue about sibling assault is that we tend to discount it," researcher David Finkelhor, director of the Crimes Against Children Research Center at the University of New Hampshire, Durham, told The Huffington Post. "We don't think of it as 'assault;' we think that's just how siblings are. But our research suggests sibling victimization is a major source of trauma and distress in the lives of children."

The recurring phone survey polled 4,000 kids up to age 17 and their caregivers about assaults between August 28, 2013, and April 30, 2014.

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