The 1890 census has them living in Cape Gerardeau, Mo and his father's death in Maries, Mo. Possibly the best route to either place could have included Freeburg. Freeburg was also a large stockyard, maybe they were on a "buying" expedition? It just seems so unwise for a pregnant woman to be traveling when so advanced. But hopefully a newspaper clipping of the birth announcement will be found explaining the story. There is another Williams in Freeburg, are they related?