Literary short story about a woman with a lithopedion who keeps it in a nursery – likely mid-20th century

I’m trying to identify a short story I read in Italian translation in the late 1990s. It was part of an anthology (multiple authors), but I don’t remember the title, editor, or cover. I strongly suspect the original author was English or American.

What I remember with reasonable confidence:

• It was a short story, not a novel (possibly 30–50 pages).
• Tone was realistic and melancholic, not horror or science fiction.
• Written in third person.
• The main charachter is a woman, probably in her 30s–40s.
• At some point in her life she becomes pregnant without realizing it (or without fully understanding it).
• Years later, after a medical episode, doctors discover she has a lithopedion (a calcified fetus).
• After its removal, she keeps it rather than discarding it.
• She places it in a cradle or nursery in her home.
• The tone around this is compassionate and sad, not sensational or grotesque.

Details I may be misremembering:

• The setting might have been around the 1940s.
• I vaguely recall a reference to “painted stockings” (WWII-era leg makeup due to nylon shortages).
• There may have been a young man connected to selling or promoting such products.
• I have a faint memory that someone later makes small figurines resembling the lithopedion, but I’m not certain about this detail.

Additional context:

• I read it in Italy in the late 90s, possibly in a book club edition (e.g., Euroclub), though I’m not sure.
• Sadly I don’t remember any other stories from the same volume.
• The lithopedion is what made the story unforgettable for me.
• It did not read like genre horror; it felt more like literary fiction with a disturbing but quiet core.

Does this ring a bell for anyone?