Slaughterhouse Five: Not So Chronological Order

"He is in a constant state of stage fright, he says, because he never knows what part of his life he is going to have to act in next." Kurt Vonnegut

At first this story starts with Kurt writing a book after the war. Then it jumps to him talking about Billy's life in the war. From there everything goes kind of haywire. It jumps from his life in war to his life as a child, to his career, then back to the war, then to his daughter's wedding, etc... Sometimes it can be a little hard to follow but he does a pretty good job of describing which part of his life he jumps to. What I wonder is what is the significance of each of these scenes in his life. Clearly the author wouldn't have Billy jump to random parts in his life that have no significance, but there are some stories I don't understand the significance. For instance when he jumps to infancy he doesn't do anything significant; he just acts like a baby. I'm hoping that as the book goes on I'll understand why he tells these stories. Also why does he jump to these stories in this order? Is there significance in that? Then there's the creepy aliens who don't explain anything, but have a very interesting theory about time. They don't see any time in chronological order, or any order for that matter. They see all moments at one time and take all things in at once. I like this idea because there is no right or wrong timing. There is only the significance of each moment. By not putting the events in the right order I think the author is trying to do the same thing.