Dear fellow Lactnuts,

In all kinds of publications and 
communications rules for handling human milk are shared. These may vary 
from how to express or pump to in what container to hold at what 
temperature for how long and how to thaw, heat, handle and feed. Some of
 the recommendations are evidence based (like overheating destroys 
bio-activity), but for many I can't seem to find any scientific basis. 
Who can provide me evidence for the following (or are they just 
assumptions and old-wife tales?):
- do not ever shake human milk (I 
really would like to know what has been observed under controlled 
laboratory circumstances with shaken milk!)
- place human milk at a 
certain place in the fridge or freezer for fear of temperature changes 
(now, really, folks, how are the odds of rising the temperature of cold 
milk in a container up to dangerous temperatures for bacteria growth by 
opening the fridge door?)
- never mix fresh milk with milk already stored (or not untill they have the same temperature)
- never heat human milk up to body temperature twice
- don't use human milk after deep-freezing for 4 or 6 months
- finish or throw away within an hour of the start of a feed

Warmly,

Gonneke, IBCLC in PP, LC lecturer in southern Netherlands

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