I recently looked at the literature on suicidality in preadolescence and early childhood. There is ample evidence that suicides and suicidal behavior occur in these populations though the suicide rate is low compared to adolescents. Joiner's IPPT has been applied to adolescent samples but not it seems to young children. Neither the theories of O'Connor ("Integrated Motivational-Volitional Model") or Klonsky and May ("Three Step") seem to have made any reference of applicability to non-adults. All three are psychological models that seem premised on the psychology and cognitive processes of mid-to-older adolescents and older individuals. Impulsiveness may play a somewhat larger role in very young children who may react or respond more quickly to triggers such as family conflict, arrive at suicide plans differently, and perhaps not ruminate on their plans in the same way as older individuals. On the other hand, very young children have been found to develop clear intent and seem exposed to experiences (e.g., abuse,  violence) that may yield acquired capability for lethal self-harm. Thoughts? 

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