I read a lot http://beegcom.in.net/ beeeg The study involved more than 1,900 families in 20 medium to large U.S. cities who were enrolled in the long-running Fragile Families and Child Well-Being study. Parents were asked how often they spanked their child when he or she was age 3 and 5, and a child's aggressive behavior and vocabulary were evaluated at 3 and 9 years.