When Mary was pregnant, her five year old, Billy, was utterly amazed and a little bit disbelieving that his sister was growing in his mom's tummy. So one day when the baby was especially active, she asked Billy to place his tiny hands on her tummy to feel the baby kick.

But when he did, the baby was suddenly still. "Oh, Billy, she must have decided to take a nap," shrugged his mother.

"A nap?" Billy marveled. "You mean there's a bed in there too?”