Where do babies come from?

Caspian told Susan this story the other day, and it was so good she wrote it down.
"I can make babies all by myself. First I get an egg then I tape it shut then I swallow it to put it in my tummy. This makes my egg baby starts to be a baby, then it pops out and I can take the tape out and I crack it open and then I see her! It becomes a baby sister."
The entertainment never stops. :)