Moms tend to cradle their babies on the left side of their bodies—and so do other mammal mamas, like walruses and flying fox. · Human moms have likely been bottle-feeding since prehistory, with archeological discoveries dating back more than 7,000 years. · The sound of a mom's voice lowers a child's stress hormone, cortisol, and raises their level of oxytocin, a hormone linked with love and bonding. · Cuddling your baby also releases oxytocin. · Simply by looking and smiling at each other, moms and babies synchronize their heartbeats to within milliseconds. ·