the changes in the brain progesterone levels for example search ten to fifteen fold baba miller and her colleagues believe that the changes in. the brain prepare a woman for her role as mother. a lot of them in the family and they make a bit of well that is probably the case that these women can recognize faces but no doubt in order to protect themselves from risks or to improve their ability to find a hold of the. czar interpretation. is the most those things that us here on. the study shows that the changes endure for at least two years after a woman has given birth there are many unanswered questions such as when exactly during pregnancy the changes take place and what exactly triggers them.