Without power? No refrigeration?
The American Academy of Pediatrics states:
In an emergency
• There may be no clean drinking water.
• There may be no sterile environment.
• It may be impossible to ensure cleaning and sterilization of feeding utensils.
The cleanest, safest food for an infant is human milk.
Below is a list of resources for those looking for detailed information about breastfeeding during emergencies:
IBFAN (International Baby Food Action Network): http://www.ibfan.org/fact-feeding_emergency.html
Transcript from WHO podcast from 2009: The importance of breastfeeding during emergencies