I thought this new research on oxytocin and bone mass was 
fascinating.  It supplies one possible explanation for the positive 
relationship between breastfeeding / having been breastfed and bone 
density.  Breastfeeding generates oxytocin in both mothers and 
children, and oxytocin is apparently good for bones.

http://www.pnas.org/content/early/2009/04/14/0901890106.abstract?

The subject came to my attention in a New York Times article about 
bones, which gives a layman's explanation. 
http://www.nytimes.com/2009/04/28/science/28angi.html?hpw

Margaret Bickmore
LLLL, IBCLC
Longmont, CO

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