perhaps a combination. it could be an imbalance along with other factors. lack of support, stress, not having the tools to deal with the weight of parenthood. I would try counseling first just to find the root of the problem. I know its hard to admit there is a problem. I went untreated for a full year and found medication and counseling helped me. try local support groups. they can usually be found at churches. or mommy and me classes. I know it sounds silly but the best first step i have found is realizing you are not alone in this.

psychiatrist. I've tried Christian counseling and I've tried meds. the meds helped

Psychiatrist , I don't think a spiritual way can fix chemical imbalances

I don't believe in spiritual. I would talk to a psychiatrist. It's their job