Here is the way that I think MPD/DID/dissociative patients should explain child alters and fragments to the public:

I, as a multiple, have child alter personalities or fragments. When I switch into those states, that child persona can say all kinds of strange things and can have all kind of strange beliefs, some of which are delusional. I exhibit the same immature mentality as if I was still a one, two, three, or four year old toddler. I cannot control it. It just happens.

(This is not so strange. It is a fact that the professionals have age regressed individuals under deep hypnosis. They have gotten and seen the same behavior as when a multiple switches into a child personality. This leads me to my belief that dissociation is simply the switching into and out of hypnotic states without control.)