My friend just recently had a baby (6 months ago) and she said that she was experiencing postpartum depression (normal); she went to the doctor and they found a medicine that is helping her.
As for the time frame, she mentioned that her friend was experiencing postpartum depression for 4 years before she went and had it diagnosed. I would go with your wife to a doctor, just to talk about what's going on with her hormones.
A lot of pregnancy and women's health is around the balance of hormones (which shift regularly), and sometimes if that balance is "off," it might cause changes in emotional behavior (like mood swings before menstrual cycles, etc).
So, I would suggest going to a doctor with your wife, and don't let her think that you love her any less. :)
YES AND I AM A WOMAN!!! THEY ARE SOMETHNG ABOUT HAVEING A CHILD THAT MAKES YOU VERY PROTECTIVE!! AND YOU HAVE NO IDEA WHAT IT IS
I WAS A ***** AROUND PPL WHEN I HAD MY FIRST AND I WAS ONLY 18 AND NOW THAT I HAVE MY 7 MONTH OLD I AM THE SAME WAY!! BUT IT ONLY LASTED FOR ABOUT A YEAR OR SO AND THEN I SLACKED OFF BUT YOU MAY WANT TO ASK HER IF SHE WILL GO SOMEWERE TO GOET SOME HELP WITH YOU BUT ASK HER IN A WAY WHERE YOU DON;T MAKE HER FEEL LIKE A BAD PERSON
I HOPE THIS HELPS YOU!!!!
LET ME KNOW IF YOU NEED ANYMORE INFO!!