An invention filed with the U.S. Patent Office allows pregnant women to partially insert a balloon in the vagina and push it out, in order to practice giving birth.

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According to the patent, when inflated in the vagina, the balloon tapers conically toward the waist, which "causes the orifice of the birth canal to dilate in a manner similar to that caused by the emerging head of a baby." Pregnant women can then "exercise by pushing the balloon out of the vagina in preparation for giving birth." Supposedly repeatedly birthing the balloon will make the real thing easier and less painful, but is better to just do it once and get it over with? [Inventor Spot]