PP Hair Loss. Did your hair return to normal?

I use to have incredibly thick hair. I was constantly having it thinned out by my stylist and could hardly manage it. After my first child I started to lose hair, it got to a point where I actually liked it better because it wasn't too thick anymore.. but then it quickly passed that point and became thin. It seemed to thicken up over time, but when my son was 16mo. I got pregnant with my second. She is now 9mo. old, my hair loss was much worse after she was born, but has stopped and now I can see the hairs starting to grow back in although VERY very fine this time.
My hair is very thin now, nothing like it use to be. Should I expect it to always be thinner than it was pre-children? Did anyone find that their original thickness returned after some time?
Thanks, mamas!