Check out Kathleen Kendal-Tacketts web site.  It has a lot of information and research article citations at 
<uppitysciencechick.com> 

It has a beautiful video on PPD, and she permits and encourages free access to use most of her publications on the site, such as the PPD video, brochures about safe sleep, articles that she has written etc.

Hope this is helpful!

Kathleen Gale Rn, IBCLC, RLC
Chicago, iL

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