What is post partum depression?
The signs of depression noted above, such as:

Feelings of hopelessness, helplessness; sadness, or prolonged grief; loss of the ability to feel pleasure or joy; suicidal thoughts, gestures, or attempts; sleeping too little or too much; agitation; loss of sexual interest; worsening of the symptoms at certain times of the day, especially mornings; social isolation; low self-esteem.

become evident or pronounced in a mother soon after she gives birth.