Hi Ginna, A while back we had a lot of postings on the net about nausea and breast feeding. I have had several mothers who had nausea problems and one mon felt so sick she was almost faint every time she breastfed and/ or pumped for about 3 weeks and then she was symptom free. Does this mother have any nausea? I think your idea of the oxytocin maybe being a factor sounds logical to me. None of mothers had any diarrhea with the nausea .At the ILCA convention last summer Dr. Klaus talked G I stimulation with breastfeeding. It seems then this all could be related, either they could be nauseated and/ or have diarrhea. Jan Aken RN IBCLC( your neighbor in the northwest.) [log in to unmask]