Smacking your child can affect their brain development, Harvard study warns 

Smacking appears to alter children's neural responses to environmental threats in a manner similar to more severe forms of maltreatment, scientists reveal. https://www.dailymail.co.uk/sciencetech/article-9465597/Smacking-child-affect-brain-development-study-warns.html?ns_mchannel=rss&ns_campaign=1490&ito=1490