Nothing changes in the past, including your arrival, because your arrival would have always happened. The past stays consistent because it was already determine

Nothing changes in the past, including your arrival, because your arrival would have always happened. The past stays consistent because it was already determined to have happened. How this would work going back in time to kill your toddler self is that, well, you don't. Gun jams, you have an aneurysm before you can, or maybe you killed the wrong toddler and there was just always a toddler killed in the past. The fact that you are alive to go back in time means you were not killed in toddler form.