L.A.
yes, I always lose tons of hair while weaning. I'm a stylist and this is the best way I can explain it:
what happens is the hair you are supposed to lose while pregnant, doesn't fall out, hence the lush pregnant hair. once you give birth, the hormones that kept this hair starts to go and so does the hair. but you are still nursing so many of those hormones remain, then, when you stop, your hair that has been collecting for 9 months starts coming out all at once.
thyroid problems are another cause of hairloss, but if it is only happening after childbirth and weaning, then thryoid probably isn't the answer.