I'm not sure if there are, and even if there are I'd be curious to see how they're written for children.
With that aside, my first thought is to wonder if it's wise to put that kind of pressure on a child that young. Not only are you literally trusting your life to your three year old, but that's an incredible responsibility for a fully grown adult much less a child.
I would probably make sure he knows how to make emergency phone calls but I wouldn't train him on emergency medical treatment.