In their defense, the doctors who examined her and believed her story did not have the luxury of passing by magazine racks in supermarket checkout lanes.  If they had, they would have recognized her as a fake.

Mary Toft (née Denyer; c. 1701–1763), also spelled Tofts, was an English woman from Godalming, Surrey, who in 1726 became the subject of considerable controversy when she tricked doctors into believing that she had given birth to rabbits.In 1726 Toft became pregnant, but following her reported fascination with the sighting of a rabbit, she miscarried. Her claim to have given birth to various animal parts prompted the arrival of John Howard, a local surgeon, who investigated the matter. He delivered several pieces of animal flesh and duly notified other prominent physicians, which brought the case to the attention of Nathaniel St. André, surgeon to the Royal Household of King George I. St. André concluded that Toft's case was genuine but the king also sent surgeon Cyriacus Ahlers, who remained sceptical. By then quite famous, Toft was brought to London and studied at length, where under intense scrutiny and producing no more rabbits she confessed to the hoax, and was subsequently imprisoned as a fraud.

http://en.wikipedia.org/wiki/Mary_Toft