Why does hair fall after having a baby, and when does it start?
About 85% of the hair on a scalp is growing at any moment and about 15% is resting. A growing hair lasts several years, and a resting hair is pushed out by its replacement after roughly four months. That steady 15% is the background shedding nobody notices.
Pregnancy changes the balance. Hormonal change keeps more follicles in the growing phase for longer. After delivery, estrogen falls, and those follicles move into the resting phase together. A few months later they all release at once. The American Academy of Dermatology says this usually starts about three to four months after birth and peaks several weeks later. DermNet NZ adds that in telogen effluvium in general, up to 70% of growing hairs can move into rest, against the normal 15%. That is why the brush, the drain and the pillow suddenly look different.
How long does postpartum hair loss last?
For most women, until around the baby's first birthday or sooner. The American Academy of Dermatology says most see their hair return to normal fullness by then. DermNet NZ gives six to nine months for the shedding to settle in telogen effluvium generally. The resting follicles are not lost. New hairs grow from the same follicles.
Hair grows slowly, so recovery in length takes longer than recovery in density. A woman can be through the shedding and still be waiting for the length to return.
Is postpartum hair loss actually normal?
Diffuse shedding after birth is widely described and a recognised pattern. The honest complication is that it is measured less well than its reputation suggests. A 2016 review of the published data found no statistically significant evidence that shedding differs between pregnant and postpartum women, and concluded the true incidence is unknown. A 2014 study of 116 women, measured with a hair-counting camera method, found more resting hairs at four months after birth than in pregnancy, and concluded there was no exaggeration of these changes in most women.
Put together, the fair reading is this. Heavy shedding after birth is a common experience and a normal pattern for many women. It is also a reason to look for a second cause when it is severe, long, or accompanied by other symptoms, because the label "postpartum" can hide a thyroid or iron problem.
Do pantang rules, hair washing or breastfeeding change it?
Many Malaysian families observe confinement (pantang) in the weeks after birth, including rules about hair washing. I do not comment on the custom. What I can say is that the hairs that come out were already in the resting phase, so a wash or a brush shows the shedding and does not cause it. No study has tested whether washing or not washing the hair changes how much falls.
Breastfeeding is a common worry. In the 116-woman study, breastfeeding mothers had a lower resting-hair proportion at four months than mothers who were not breastfeeding, and no difference across the first postpartum year. It is a small study and the result should not be pushed further than that. Nothing in it is a reason to stop.
When should iron and thyroid be checked?
Earlier if there are other symptoms, and at the latest if the hair has not recovered by about a year.
Thyroid first. Postpartum thyroiditis affects about 5 to 10% of women in the United States, according to the American Thyroid Association. It has an overactive phase around one to four months after delivery, with anxiety, palpitations, poor sleep and weight loss, and an underactive phase around four to eight months, with tiredness, weight gain, constipation, dry skin and low mood. Most women regain normal thyroid function within 12 to 18 months, and about one in five of those who become underactive stay that way. Women with autoimmune disease, thyroid antibodies, earlier thyroid problems or a family history are at higher risk. These are the symptoms that matter. Hair is not on the association's list, but low thyroid function is a recognised trigger for telogen effluvium.
Then iron. In a 2025 study of 50 women with telogen effluvium, the average ferritin was 24.3 ng/mL against 44.8 in 50 comparison women, and 28% of the cases had ferritin below 15. A larger 2025 retrospective review of 2,851 women found low ferritin in 46.5% of those tested. Neither study was limited to new mothers, so the numbers describe telogen effluvium in women in general. A test shows whether iron is actually low. A guess does not, and a supplement taken without a result can hide the answer.
DermNet NZ also lists vitamin B12 and folate among the usual checks. A doctor chooses the tests from the history. This is the kind of work-up described in hair loss is several diseases, which one is yours.
What helps while the hair recovers?
For the common pattern, time is most of the treatment, and the useful work is to rule out a cause that can be corrected. Gentle handling, not pulling the hair back tightly for long periods, and adequate food and rest are sensible habits. No trial shows that any of them changes the course.
Hair medicines such as minoxidil and finasteride treat other conditions and have their own rules around pregnancy and breastfeeding, set out in what these hair loss medicines do. They are not an answer to ordinary postpartum shedding, and a doctor should decide whether any is suitable.
Hair is also rarely the only change after birth. Stretch marks, pigment and skin laxity come on the same timetable, and they are covered in stretch marks: what helps and what does not, loose skin after weight loss and which skin treatments can wait in pregnancy and breastfeeding.
When is it not postpartum shedding?
See a doctor when any of these apply: the hair has not regained normal fullness after about a year; there are bald patches rather than an even thinning; the scalp is itchy, scaly, sore or red; the part keeps widening or the hair keeps getting finer; or the shedding comes with tiredness, palpitations, feeling cold, constipation or low mood. The American Academy of Dermatology advises seeing a dermatologist if the hair has not recovered by the first birthday.
There is also a quieter possibility. DermNet NZ notes that postpartum shedding can resolve in a few months or transition into female pattern hair loss. Shedding can uncover a pattern that was already starting. That is not a failure of recovery. It is a different diagnosis, and a different conversation, which the hair thinning page sets out.
The honest complication
Telling a new mother that it is only hormones and will pass is usually right and occasionally wrong. The cases where it is wrong are the thyroid problem and the low iron that nobody tested for because everyone assumed the hair was simply postpartum. A normal pattern deserves reassurance. A long or heavy pattern deserves a blood test.
