Ran across the following article

Mothers with breastfeeding difficulties more likely to suffer postpartum depression Medical Express July 19, 2011

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"We found that women who said they disliked breastfeeding were 42 percent more likely to experience postpartum depression at two months compared to women who liked breastfeeding. We also found that women with severe breast pain at day one and also at two weeks postpartum were twice as likely to be depressed compared to women that did not experience pain with nursing,”

The idea for the study, published online ahead of print by the journal Obstetrics & Gynecology, grew from the clinical experience of senior author, Alison Stuebe, MD, an assistant professor in the Department of Obstetrics and Gynecology in the UNC School of Medicine.
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References

• Original News Release
• PubMed Abstract

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The great consumption of vitamin D during pregnancy and breastfeeding could be one of the causes of Postpartum Depression

• An Exploratory Study of Postpartum Depression and Vitamin D - May 2010
  • One of the authors: Carol L. Wagner

Hypothesis: low vitamin D may be one of the causes of the dislike of breastfeeding

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See also VitaminDWiki

• Many articles on depression and low levels of vitamin D 31 items as of July 2011
• Less than 20 ng vitamin D increases depression by 80 percent – Dec 2010
• Vitamin D and help prevent depression - April 2010
• Overview: Vitamin D: Before, During, and After Pregnancy