Of the nearly 2,500 youngsters in the study, those who were spanked more frequently at age 3 were much more likely to be aggressive by age 5....
http://www.time.com/time/magazine/article/0,9171,1983895,00.html
Corporal punishment [of children]is linked with nine other negative outcomes, including increased rates of aggression, delinquency, mental health problems, and problems in relationships with their parents.
Large, peer-reviewed studies repeatedly show that the more children are hit, the more likely they are to hit others, including peers and siblings. As adults, they are more likely to hit their spouses. The more parents spank children for antisocial behavior, the more the antisocial behavior increases. All of the peer reviewed studies being published continue to confirm these findings.
http://www.ahaparenting.com/parenting-tools/positive-discipline/should-I-spank-my-child
Research has shown that the more children are spanked, the more likely it is that children will:
Engage in antisocial behavior, such as lying, stealing, cheating, bullying, assaulting a sibling or peers;
Act aggressively toward others;
Develop mental health problems, such as depression and suicidality;
Have a less close relationship with their parents;
Be physically abused by their parents.
http://www.opposingviews.com/arguments/spanking-has-negative-side-effects
Of the nearly 2,500 youngsters in the study, those who were spanked more frequently at age 3 were much more likely to be aggressive by age 5....
http://www.time.com/time/magazine/article/0,9171,1983895,00.html
Read more:
http://www.time.com/time/magazine/article/0,9171,1983895,00.html#ixzz1zrCxTSPK
Positive child outcomes are more likely when parents refrain from using spanking and other physical punishment, and instead discipline their children through communication that is firm, reasoned, and nurturing...
http://www.childtrendsdatabank.org/?q=node/187