Hair, stretch marks, and how you feel about your body: what has actually been counted
Nobody has ever measured how many women lose hair after a birth, or when it stops. The timeline you have read everywhere has no source behind it.
Start with hair, because it is the clearest example in this whole guide of how confident popular writing can be about nothing.
Search the medical literature for how common postpartum hair shedding is, and there is no answer. No prevalence figure. No distribution of when it starts. No distribution of when it stops. What comes back instead is a general dermatology literature about hair shedding in adults, with no postpartum epidemiology at all.
Meanwhile every popular source gives you the same timeline: it starts around three months, it settles by six to twelve. That timeline cannot be traced to a study. It has been copied from source to source until it acquired the sound of a fact.
Why does this matter enough to spend a topic on? Because a timeline nobody measured turns into a deadline. If your hair is still coming out at nine months, there is no published study that says you are late, because there is no published study at all. The physiology is understood and the experience is described constantly in clinical practice. How common it is and how long it lasts have never been counted.
Stretch marks. Here there is a real literature, in several countries, but none of those studies was read in full for this guide, so no percentage appears here. What can be said without a number is the part that matters: stretch marks are scars rather than swelling. They fade and change colour. They do not disappear, and no treatment has been verified here as preventing or reversing them. Anyone selling you one is ahead of the evidence.
How you feel about your body. No cohort available for this guide printed how many women are dissatisfied with their bodies at a given point after a birth. If you are shown one, ask where it came from.
What has been measured is an association, and it is a strong one. In an Irish study of 832 first-time mothers followed to a year, women who said they were never satisfied with their body had 3.6 times the odds (95% confidence interval 1.9 to 6.7) of having lost interest in sex at twelve months, compared with women who said they were always satisfied. Women in the middle group sat between the two, though at twelve months that middle estimate did not reach statistical significance. At six months the same gradient showed up for vaginal dryness.
To put an absolute number beside that relative one: in that cohort, 39.8% of women reported loss of interest in sex at twelve months, against 33.0% before they were ever pregnant.
The reason this belongs here rather than only in the topic on sex is what it beat. In the same analysis, neither the way a woman gave birth nor the degree of any tear remained significant once everything was adjusted for. How she felt about her body did.
"Is there anything to rule out here, or is this something I just live through?"
"When you say it will settle down, is that from a study, or is that the usual thing people say?"