Researchers at Columbia University found kids who were spanked at 5-years-old were slightly more likely to be aggressive and break rules later on in elementary school.
According to the Los Angeles Times, 1,500 families were asked questions about their child's behavior and whether they had spanked their children within the last month.
The answer was frequently 'yes' with 52 percent of mothers and 33 percent of fathers saying they spanked their children when they were 5 years old.
When the kids turned 9, parents were again asked about their child's behavior. The researchers also gave the children a test that measured their vocabulary.
There was no link between spanking by parents at age 3, and their children's later behavior.
The Fragile Families and Child Well-Being Study followed children from 20 U.S. cities from birth to age 10. Most were born between 1998 and 2000.