I fail to understand why the medical fraternity doesn't more carefully consider the existing evidence that nutritional deficiency is at the root of a lot of postpartum depression.   In particular, vitamin B12 deficiency likely is a significant contributing factor.

Using drugs like Prozac to address this amount to using a coat of paint to fix a rotting fence.  It's purely on the surface.   Drugs like Prozac don't deal with the underlying biological and biochemical issue.