Postpartum hair loss

Key takeaways

• Very common. In a questionnaire study of 331 mothers surveyed 10 to 18 months after delivery, 91.8% reported postpartum hair loss; on average it started at 2.9 months, peaked at 5.1 and ended at 8.1 months (Hirose 2023). Only 21% of those invited responded, and women with hair loss may have been more likely to take part, so the true share may be lower.
• The hair-cycle explanation is supported. Measurements in 116 women found a higher share of growing hairs in late pregnancy and a higher share of resting hairs at 4 months postpartum, though the changes were not exaggerated in most women (Gizlenti 2014).
• Some experts doubt it is a distinct disease. A 2016 review argued none of the papers it reviewed showed a significant difference in shedding between pregnant and postpartum women (Mirallas 2016). The safer summary is that shedding is common but the amount is poorly quantified.
• Breastfeeding and preterm birth are associated with it in one study (Hirose 2023), but another found a higher growing-hair share in breastfeeders at 4 months and no group difference by one year (Gizlenti 2014). The role of breastfeeding is unclear.
• It can go with distress. Women reporting "very much" hair loss had higher odds of anxiety on a short screen (adjusted OR 4.58, 95% CI 1.18 to 17.74), though cross-sectional data cannot show direction (Hirose 2024).
• Do not assume it is just postpartum. In 200 women with postpartum shedding, only 9.5% had telogen effluvium alone; 56% also had androgenetic alopecia, 6.5% traction alopecia and 28% all three (Galal 2024).
• Check the thyroid if it drags on. Postpartum thyroiditis affects about 5% of women in the first postpartum year and can bring fatigue, palpitations or mood symptoms (Nguyen 2019). See thyroid and hair.
• No treatment has been shown to speed it up, and no trial specific to postpartum shedding was found.

What is going on

During pregnancy, hormonal changes keep more follicles in the growth phase for longer. After delivery hormone levels drop and they return to the resting phase within about 3 to 6 months, producing a synchronized shed (see hair growth cycle). The result is diffuse thinning, especially at the temples and hairline, with no bald patches or scarring. New hairs regrow as short baby hairs.

Look-alikes and add-ons to consider if shedding is heavy or lasts beyond a year are androgenetic alopecia, traction alopecia, iron deficiency or anaemia (see iron and ferritin), and thyroid disease.

Hair type notes

• Long, fine or low-density hair shows shedding more.
• Tight postpartum styles such as buns, braids and ponytails can add traction damage to regrowth zones (traction and hairstyles).

Bottom line

Expect a shed starting around 2 to 3 months, usually peaking at 4 to 5 months, with regrowth after. See a clinician if shedding lasts over a year, hair is visibly thinner in a pattern such as a widening part, or you have fatigue, palpitations, mood or weight changes, or signs of heavy bleeding or iron deficiency. Treat hair gently and avoid tight styles at the hairline. Finasteride, dutasteride and spironolactone are not for women who are pregnant or breastfeeding, and minoxidil is generally avoided too unless a doctor advises otherwise. Mental health matters. Discuss with a doctor.