According to this study published in the Journal of Psychosomatic Obstetrics and Gynecology, obstetricians tend to be more aware of screening practices than pediatricians.
What is clear is that universal PPD screening practices are needed.
Reference: J Psychosom Obstet Gynaecol. 2010 May 19. Postpartum depression: an original survey of screening practices within a healthcare system.Chadha-Hooks PL, Hui Park J, Hilty DM, Seritan AL.
Department of Psychiatry and Behavioral Sciences, University of California, Davis Medical Center, Sacramento, CA 95817, USA.