Is this itching on the side she is nursing on? I've seen lots of dermatitis that is exacerbated by heat and sweat. I have also prescribed Zyrtec (generic name: cetirizine--a newer antihistamine--at least in the US) to breastfeeding women with older toddlers. One of its indications is chronic, idiopathic urticaria. I haven't had anyone say that it affects their milk supply. Also, Zyrtec is indicated for young children, and I've seen it prescribed by ENT's to as young as two year olds. Any thoughts Dr. Jack, Dr. Rob, Dr. Hales??? Julie Jarvis RPA-C, Kansas mailto:[log in to unmask]