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That amount of spanking is too much - a sign that the family is dysfunctional, they say. Much more sophisticated studies have long shown that occasional corporal punishment is actually effective against troublemaking behavior. And it's not harmful if used only on children between 18 months and 6 years old, they say. In a 1996 review of all the studies done on spanking, a scientific reviewer reporting in the journal Pediatrics showed that many were flawed, though they came to widely varying conclusions. Many parents aren't sure.