Risk of suicide in young children

There is a lot of material available about assessing for risk of suicide in adolescents, but much less that focuses on small children. Some cases are relatively (and I mean relatively) straightforward, like the child who says he is going to kill himself in anger when he doesn't get his way. But I have seen a fair number of young children where it is more complicated. Some of them may express the suicidality in anger, but they also take actions like grabbing a kitchen knife or putting shoelace around their necks and pulling it.

Now, in all of the cases I have seen this action has been taken in full view of parents or other adults, which makes it somewhat less concerning (at least in terms of immediate risk for suicide), but nevertheless the child has taken an action which, if done at another time and in a slightly different way could be dangerous.

Our frameworks for assessing risk in adults fall short in these cases. I know I feel on less steady ground. If anyone knows of good resources--ones that not only provide risk factors, but ways of conceptualizing suicidal behavior in young children, I'd love to hear from you.