According to a study, breastfeeding helps mothers protect newborns from danger. The results showed that nursing mamas protected their babies twice as aggressively as bottle-feeding mamas. If someone is threatening their baby – watch out!:) Research suggests that nursing amps up mother’s physiological reaction to perceived threats. “Lactation aggression” has been demonstrated in lions, rats, and other non-human mammals – but this study is the 1st to show it in humans.