Your sense of smell could also be more accute... I found that my smelling super-powers from my first pregnancy never diminished... I never really used to be able to smell myself before... now I can all the time... even when I am clean... and so i am more fond of wearing perfume these days compared to pre-children. But I avoided wearing too much underarm deodorant when i was BFing my newborns... given that their little noses are so close to that area... i didn't want them to feed in a haze of deodorant.. I imagine that would be pretty off-putting. So i used scentless crystal sticks (essentially just salt)... but that didn't deal with the smell very well... lucky I wasn't a big sweater I guess. And I didn't leak that much when i BF either... like the others said, if you have a sour dairy smell about you then that's probably it.

Oh well, we're heading into winter... that should help!