There's this, hot off the press, in JHL, hope it helps.

Pamela Morrison IBCLC
Rustington, England

  J Hum Lact. 2005 Nov;21(4):444-9.Symptoms of postpartum depression and 
breastfeeding.Hatton DC, Harrison-Hohner J, Coste S, Dorato V, Curet LB, 
McCarron DA.
Department of Behavioral Neuroscience at the Oregon Health & Science 
University.

Despite important health benefits, the presence of depressive symptoms may 
decrease the prevalence of breastfeeding. The current study assessed the 
relationship between depressive symptoms and breastfeeding at 6 and 12 
weeks postpartum. Participants were recruited from a cohort completing a 
clinical trial of calcium for prevention of preeclampsia. At 6 weeks 
postpartum, the Edinburgh Postnatal Depression Scale (EPDS) was completed 
by mail. At 12 weeks postpartum, the EPDS was completed at an outpatient 
visit. There was an inverse relationship between depressive symptoms and 
breastfeeding at 6 weeks postpartum (P < .001) but not at 12 weeks. This 
relationship persisted even after controlling for prior history of 
depression, increased life stress, and current psychoactive medication. The 
results suggest that depressive symptoms early in the postpartum period may 
lower the prevalence of breastfeeding.
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