When my first child was a baby, I suddenly and often had vivid imaginings of terrible things happening to him. I had trouble watching my husband carry him downstairs, but it wasn't just obvious things like this. If this has never happened to you, you may think I sound paranoid or even delusional but it turns out to be quite normal to have fairly detailed near-hallucinations of death when you're a new parent.
I no longer do this quite so much now that he's 4. So that ends and that's nice.