In the 18th and 19th centuries, sideshow carnivals in Japan featured educational and entertaining pieces designed to solve the mysteries of life. Among the most popular attractions was the pregnant doll, believed to teach midwives how to deliver babies, and just to entertain.

It's very human-like, and represents each stage of pregnancy, including birth (no, they don't provide HOW the baby got there in the first place). It even comes with a open-able vagina and various fetuses, complete with an umbilical cord. You can even remove its belly to see what's inside.

To make it even more fun, they decided to make the doll ghost-like and totally creepy! Records suggest that this model was a hit in 1877.

19th-century pregnant dolls [PinkTentacle]