There was basically the same question just a few days ago: https://www.reddit.com/r/explainlikeimfive/comments/1ftua1b/eli5_why_do_some_injuries_last_forever/
Also a pregnancy (from a biological pov) is a fucking nightmare to the female body. It easily leads to lasting conditions and issues. Stretchmarks being one of the minor issues. But perineal tears are common during birth. Spontaneous rib fractures during the last trimester aren’t that rare. Diabetes, incontinence, thyroid issues, IBS a lot of other endocrine issues and more can develop during a pregnancy and persist afterwards.
Even with modern medicine, pregnancy takes a heavy toll on the human body and should not be underestimated.
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