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What actually happens to your hair from pregnancy to 18 months postpartum
You've noticed your hair changing and you want to know whether what's happening to you is what happens to everyone. Short answer: almost certainly yes — and knowing the timeline…
You've noticed your hair changing and you want to know whether what's happening to you is what happens to everyone. Short answer: almost certainly yes — and knowing the timeline in advance makes every stage of it less alarming.
This is the full arc, from the first trimester to your toddler's first birthday and a bit beyond. Each stage gets its own deeper post; this one is the map.
Why does pregnancy change your hair at all?
Every hair on your head cycles through three phases: growing (anagen), transitioning (catagen), and resting (telogen). Normally about 85–90% of your hair is growing and the rest is resting, and resting hairs shed after a few months to make room for new ones.
Pregnancy hormones — mainly rising oestrogen — hold more hairs in the growing phase for longer. Fewer hairs move into rest, so fewer shed. Nothing new is being created; you're simply keeping hair you would ordinarily have lost.
What should I expect while pregnant?
By the second trimester, many women notice hair that feels denser and holds a style longer. Texture can shift too — waves loosening or tightening — and the scalp often behaves differently: oilier for some, drier or more sensitive for others, partly down to hormones and partly to running warmer and sweating more.
None of this is universal. Some women notice nothing, and that's equally normal.
When does the postpartum shed start?
After birth, oestrogen drops quickly, and all those hairs that were held in the growing phase move into rest together. Resting hairs take roughly two to three months to release — which is why the shed typically starts around month two to four postpartum, not immediately after delivery.
It can be confronting: handfuls in the shower, a fuller hairbrush, hair on the baby. But it's a synchronised release of hair you kept during pregnancy, not hair you're losing from your future total.
How long does the shedding phase last?
For most women, the heaviest shedding runs from around month three to month six, then tapers. By nine to twelve months postpartum, most women's shedding rate is back to their pre-pregnancy normal. Breastfeeding, sleep, stress and individual variation all shift the edges of that window, so treat these as ranges, not deadlines.
If shedding is still heavy well past the twelve-month mark, or you're seeing patches rather than overall thinning, that's a conversation for your GP — there are other things (thyroid changes, iron levels) worth ruling out, and that's beyond what any hair care can address.
What's the regrowth stage like?
From around month six onward, the hairs that shed start growing back — all at once, all short. This is the era of the halo: fine new hairs standing upright along your part and hairline. It can look like breakage; it's usually regrowth. New hair grows at roughly 1 to 1.5 cm a month, so those bits take real time — often a year or more — to blend back into your length.
The 6–18 month window is mostly about living gracefully with two hair lengths at once: styling choices, gentle handling of fragile new growth, and patience with a timeline you can't rush.
What can I actually do today?
One concrete thing: take a photo of your part line and hairline in natural light, today, and repeat it monthly. Whatever stage you're in, a monthly photo series gives you real data instead of shower-drain panic — you'll see the shed peak and taper, and later you'll see the regrowth halo appear, in a way day-to-day mirror checks never show you.
Then read the post for your stage — each one goes deeper on what's happening and what helps it look and feel better while it does.
This article is general information, not medical advice. Postpartum hair shedding is common and usually temporary, but everyone’s situation is different. Please speak with your GP, midwife or maternal child health nurse about your own health — especially if you’re pregnant or breastfeeding.