I’ve just had a ba, I’m 5,4 9 stone 6 and a small 34b before I just had 350cc high profile round and I was stuck between 350 and 375 I went under the muscle and I’m just under two weeks post op and you loose around 25-50cc under the muscle and I’m very happy with my size , I tried on a bra and it was a 32c and it fit but I think may be slightly to small , but I won’t be able to fully tell until a few months is old say go with the 350 or 375 cc hope this helps xx