Shedding after having a baby is normal and very common. There are all kinds of reason why it may happen, estrogen levels, etc. I went through it with my first DS and anticipating it happening with my next in July. I agree with Nonie--unreleased/removed shed hair causes the most harm, almost more harm the the actual shedding itself. I know it's hard to watch (losing that much hair daily for however long it lasts), but for me it was best for me to wear my hair in a style that I could let the shed hair be released often so that it didn't create knots and tangles causing me to lose more than just the shed hair. I think a lot of women turn to low manip styles because they can't take seeing the hair being shed, but after they take down those styles they have so many knots and tangles they end up with bald spots, etc. and blame that on the shedding itself.
Anyway, when I was going through it, I was wearing buns and was co-washing every-other to every couple of days. Once it was over, my edges where noticeably thinner, but they filled back in fairly quickly after. Once it's over, THEN go to the low manipulation styles.