Five-year-old Letz ponders the mysteries of the womb. "When you were in my tummy, you were connected to me by your belly button." But wouldn't that have to be outside her tummy? Does Mom have a belly button inside, too? This is the story of how a little kid imagines the story of their birth. It's the fourth entry in the Letz series and features cute, full-color illustrations by Shinsuke Yoshitake on every page.