Hi Jaye,
I'm asked this a lot at work.  I tell pts that world wide the average age is 4 or 
5 years.  I have heard this but cannot remember where the source was.  It 
may have been www.health-e-learning.com when I was studying to take the 
IBCLC.

HOpefully you will get a good response with a definate study.
Carry on my friend.
robin

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