My Nan had this done to her.
In England.
In 1953.
And the doctors didn't tell her
She found out about 4 years ago after a fall. They did an X-ray to check for breaks. The doctor who came to see her started by asking "did you have a baby in the early 50s?"
It finally gave her peace about why she suffered so much after giving birth. The pain was so intense she could hardly walk. Often, she'd have to sit on the pram carriage and Grandpa would wheel her home.
Silver lining: my massive-headed mother cam out just fine 3 years later 