Hi! It is my understanding that postpartum hair loss is due to pregnancy, not breastfeeding. I did a medline lit search and only came up with one article "Changes in women's physical health during the first postpartum year" Arch Family med 1993 Mar;2(3):2770-83. Also I seem to remember this being discussed in Williams Obstetrics but my copy is at home... Anecdotally, I have lost tons of hair with all three of my pregnancies. My second baby died a few hours after birth and consequently I didn't have anyone to feed, but my hair loss was still just as prevelant that time as with the other two; both of whom were (and my 4 1/2 month old still is ) totally breastfed. Wendy Funk, MCH Epidemiology