'Negative Parenting' Starts Aggressive Personalities Early

Aggressive behavior is fairly common in toddlers, but in most cases, this drops off by the time they reach age 5. In children whose aggressive behavior does not stop, they have a pretty good chance of staying that way, Lorber said.

"Conduct problems around age 5 are probably one of the strongest predictors of anything that you care to predict for years to come, including depression, substance use, academic problems and peer rejection," Lorber told LiveScience. "They predict even aggression against one's romantic partner later in life."

The researchers found that children who exhibit aggressive, defiant and explosive behavior by the time they're in kindergarten very often have tumultuous relationships with their parents from early on.

http://www.foxnews.com/health/2011/10/26/negative-parenting-starts-aggressive-personalities-early/