I think most women go through a hair-looks-like-crap period of time after having a baby. I did...but my hair always went back to normal after a year or two. I think that's yet another reason why it's desirable to wait a couple years between babies. Pregnancy depletes maternal stores of nutrients, and it takes a while to build that back. I would imagine having several pregnancies in a row would make it even harder to come back from.