I have been asked this question by a doula. She has a client who is breastfeeding twins (sorry, can't remember their age) and was being treated for mastitis with a 10-day course of antibiotics (the doula didn't know which ABX). She states that shortly before the end of the treatment, the mom had about 48 hours when her milk "smelled sour". The babies didn't reject it, but the mom noticed it both on her breastpads or if she pumped (not after storage, but directly from the breast). She states that it was sour "like when the baby spits up". The sour smell then disappeared and is now fine, but they were curious about it. Any ideas? Miriam Levitt RN, IBCLC *********************************************** The LACTNET mailing list is powered by L-Soft's renowned LISTSERV(R) list management software together with L-Soft's LSMTP(TM) mailer for lightning fast mail delivery. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html