I did loose heaps of hair starting when Matilda was 12 weeks until she was 18 weeks and I was bf for the most of that time. I had handfuls of it coming out in the shower...

One thing girls to note that thyroid problems can come about during hormonal changes post baby and if you have any other symptoms get them checked by you GP... I was lethargic as well & just plain ol yucky so I went to GP to get checked & I was a bit out of whack...