It’s an obvious one, but it’s good to see the science being done. A “Daily Mail article”:http://www.dailymail.co.uk/pages/live/articles/health/womenfamily.html?in_article_id=369379&in_page_id=1799 says that recent studies have shown increased levels of oxytocin and arginine vasopressin, hormones involved in social bonding, in children who were held, cuddled, and otherwise lavished with love and attention as babies. The hope is that this research will help to understand why orphaned children have trouble bonding with adoptive families, with the possibility of developing a treatment.