When a child comes in I believe that it's a 'multipersonhood ' and it knows it its consciousness knows it and it has a nuclei in the center of its consciousness that is the repository of all experience and all knowledge. And when you look in the eyes of your baby and you feel this sense that they are an old soul I believe indeed they are.
There's a lot of interest from the medical community on how things develop in microgravity and the hope later that is expected to apply to what the changes are in humans as well.