Yep, this is totally normal. I am not sure if it is a BF or post natal thing, but I had the most unbelieveable amount of hair falling out for about 6 months after having DD. I thought it would all fall out for a while there! But it didn't, eventually it stopped happening and it was never enough for anyone to notice from looking at me (apart from all the hair that would get stuck to the back of my top too!). I have heard that it is just evening things out because while you are pg the hormones mean you don't shed as much hair as normal.

I hope it stops soon!