with dd1 I went from a 34 to a 40 (!!) during pregnancy - eventually I went back down to a 36 post partum (by the time I got pregnant again). I didn't expand this time very much - now I wear between 36-38 though my cup size went up a lot. Of course it all depends on what bras you buy - I seem to very a lot between brands on both cup and band.
1/16/12 at 10:18am