Spanking is a super common — and many times, socially acceptable — way many parents choose to discipline their kids, but a 2009 study revealed that physical punishment can actually REDUCE the grey matter in children's brains.
As shocking as that may sound, the study concluded that "exposing children to HCP (harsh corporal punishment) may have detrimental effects on trajectories of brain development."
Whether or not you agree with the findings (or not), here are the 9 things you really teach your kids when you spank them.