Could birth control raise depression risk in new mothers?

Copenhagen University Hospital–Rigshospitalet and collaborating Danish universities have conducted statistical research suggesting that starting hormonal contraceptive (HC) use postpartum is associated with a 49% higher risk of developing depression compared to nonusers, though the modeled absolute risk difference over 12 months was only 0.18 percentage points. Associated risks were assessed to be higher the earlier use was initiated postpartum.