The Wprld health Organization Global Strategy for Infant and Young Child Feeding (IYCF) has a whole section related to feeding during emergencies: http://search.who.int/search?q=infant+and+young+child+feeding+feeding+in+disasters&ie=utf8&site=who&client=_en_r&proxystylesheet=_en_r&output=xml_no_dtd&oe=utf8&getfields=doctype
There was hardship, poverty and unemployment during the Lancashire Cotton Famine in the 1860s and the siege of Paris 1871, as a result of which far more mothers had to stay at home. They were thus able to devote more time and effort to breastfeeding, resulting in dramatic falls in infant mortality.
Dr. Karleen Gribble, in Australia, has several publications on this, including Gribble, K., McGrath, M., MacLaine, A. and Lhotska, L. (2011), 'Supporting breastfeeding in emergencies: Protecting women's reproductive rights and maternal and infant health', Disasters, vol 35, no 4 , pp 720 - 738., which you can find at: http://www.uws.edu.au/staff_profiles/uws_profiles/doctor_karleen_gribble
International Lactation Consultant Association has resources for breastfeeding mothers and babies in emergency on their website at http://www.ilca.org/i4a/pages/index.cfm?pageid=3733
Emergency Nutrition Network has material www.ennonline.net The U.S. Department of Health and Human Services' Office of the Assistant Secretary for Preparedness and Response has launched a resource system to improve disaster preparedness. The Technical Resources, Assistance Center, and Information Exchange (TRACIE) that has a little bit on infant feeding (interestingly in the women's health section rather tan the child health section.