This paper reviews the frequency of suicide and filicide in a literature of over 4000, and personal series of 321, childbearing psychoses. Suicide is rare during the acute episode, but the rate is high later in the mother's life and in first degree relatives. The filicide rate is high in depressive psychoses (4.5 %), but lower in episodes without overt depression (less than 1 %), and some of these appear to be accidental, without intent to kill.
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Ian Brockington (2016) studied this question.
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