Because postpartum psychosis is more serious, it should be treated with the help of a knowledgeable health care professional.

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Yates had a history of postpartum psychosis, major depression and two suicide attempts before she drowned her children and laid their bodies on her bed, covering them with a sheet.

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Yates had pleaded not guilty by reason of insanity, and her lawyers argued that severe psychosis brought on by postpartum depression following the birth of her youngest child, Mary, led her to commit the killings.

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