https://electricliterature.com/what-i-dont-tell-my-students-about-the-husband-stitch-690899157394
https://books.google.com/books?id=mZ0RAAAAYAAJ&pg=PA43&dq="husband stitch"&hl=en&sa=X&ved=0ahUKEwi9yeaGkOnWAhUrrFQKHYvKAt4Q6AEILzAB#v=onepage&q="husband stitch"&f=false Dr. Geo Cupples, from 1885, in "Transactions of the Texas Medical Association."
https://books.google.com/books?id=noA_AAAAYAAJ&q="husband stitch"&dq="husband stitch"&hl=en&sa=X&ved=0ahUKEwjunsuAkunWAhVhlFQKHQBhDRUQ6AEINjAD 1958, What Women Want to Know: A Noted Gynecologist's Guide to the Personal Problems of Women's Health.
"Who’s Afraid of the ‘Husband Stitch’? New Moms Everywhere." https://www.fatherly.com/health-science/why-parents-fear-husband-stitch/ by Lauren Vinopal, published August 17, 2017, calls the stitch "a procedure of no medical value that some doctors still perform if pressed" and includes some links to some academic articles I can figure out how to get:
A number of studies published in https://www.thieme-connect.com/products/ejournals/html/10.1055/s-0031-1281482 Seminars in Plastic Surgery and http://www.tandfonline.com/doi/abs/10.1080/13691050152484704 Culture, Health & Sexuality .... Virginia Braun and Sue Wilkinson of Loughborough University wrote in the http://www.tandfonline.com/doi/abs/10.1080/02646830020032374 Journal of Reproductive and Infant Psychology.
I should also look up Sheila Kitzinger's 1994 The Year After Childbirth: Surviving and Enjoying the First Year of Motherhood and her autobiography A Passion for Birth: My life: anthropology, family and feminism for more. I figure that from those I'll also find more terms to search for.
French: ‘le point du mari'.