I am a new subscriber to Lactnet, using e-mail address [log in to unmask] I would like to introduce myself and ask for some information. My name is Lori Dobud, I am a Public Health Nurse and IBCLC in New Westminster, B.C. Canada. Has anyone had any experience with mothers who have frozen their milk and after thawing had it taste sour or rancid (fresh expressed milk frozen immediately in plastic bottle liners). Any idea on what could be the cause? ttfn Keith Coueffin Chief Environmental Health Officer New Westminster Health Dept 537 Carnarvon St. New Westminster, B.C. V3L1C2 phone 527-4406 fax 525-0878