Heather writes:

But  speaking generally, we know that consistent care-giving by one or 
two  people is the physiological, psychological and emotional norm for human  
infants.


~~ Do we know this? Maybe others with background in working in developing  
countries, and people with backgrounds in ancient civilizations can comment on  
whether this is a more recent scenario.
 
Peace,
Judy  

Judy LeVan  Fram, PT, IBCLC, LLLL
Brooklyn, NY,  USA

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