Post-partum depression is a MUST be aware of issue! It is more common than you think. It is NOT the baby blues. It is not just low self-esteem. Research is associating it to hormones. Suicidal thoughts are the effect of a brain gone haywire. That is why it can strike women who has never experienced depression before. Please pass this on.
Of other note, other risk times are the onset of puberty (teens) and peri-menopause/menopause. These are also hormone influenced.