What happens to postpartum hormones after birth, and when they level out

It's day four. You cried at a commercial, woke up soaked at 3 a.m., and you feel raw. A lot of that is chemistry. If you'd like support, we offer postpartum and perinatal therapy in Kitchener-Waterloo, in person or online anywhere in Ontario.

This article walks through postpartum hormones in plain language: what changes, roughly when, which symptoms are common, and when it's worth reaching out.

Your postpartum hormones timeline, week by week

Every postpartum experience is different, so think of this hormone timeline as a rough guide, not a schedule. The biggest shift starts the moment the placenta is delivered, because it made most of the pregnancy hormones. Here's what often happens to hormones after birth.

The first few days: the hormone crash

Within a day or two, estrogen and progesterone fall from their highest levels of pregnancy to very low levels. This hormone crash is one of the fastest hormonal changes a body ever goes through. You might notice:

• tears that come out of nowhere
• feeling wired and exhausted at once
• feeling shaky or teary
• night sweats in the first postpartum nights
• a rush of love and tenderness for your baby

Weeks one to six

Estrogen levels stay low, especially if you're feeding your baby at the breast. Prolactin rises to make breast milk, and oxytocin surges with feeding and skin contact. In these early postpartum weeks:

• mood swings and the baby blues often peak, then ease
• you're healing from the birth
• broken nights add to the strain
• you can feel tearful and joyful in the same hour

Six weeks to three months

Around six weeks, many postpartum parents have a check-up and are told they're "recovered". Progesterone levels begin to return for some, especially if the baby is formula fed, and a first period may arrive. Common at this stage:

• fewer postpartum sweats
• steadier days, with some hard ones mixed in
• the first signs of hair shedding
• more steady stretches

Three to six months

Somewhere around three months, hair loss is common as estrogen drops back from pregnancy levels. Many women notice their emotions steadying in this window. You may see:

• shedding that peaks, then slows
• fewer big swings in how you feel
• a little more energy each week
• your baby settling into longer stretches

Six months to a year

By six months, estrogen and progesterone are often close to where they were before pregnancy, though breastfeeding can keep estrogen lower for longer. Some parents notice:

• periods becoming more regular
• more good days than hard ones
• changes as feeding winds down
• tiredness or low mood that lingers, which is worth checking

Which hormones change after birth?

Estrogen and progesterone

During pregnancy, estrogen, progesterone and other hormones rise to very high levels. After the baby arrives they drop quickly. Low estrogen can affect your temperature and how steady you feel, and it explains a lot of the heat and dryness women describe. Progesterone has a calming effect for many, so the hormonal drop in progesterone can leave you feeling unsettled.

Prolactin and oxytocin

Prolactin is the hormone that tells your body to make milk. Prolactin levels stay higher while you're breastfeeding, which can delay your period. Oxytocin helps milk flow and supports bonding with your baby. Oxytocin levels rise with feeding, cuddling and skin contact, and oxytocin can bring a deep sense of calm. That's why some parents feel oxytocin as a wave of warmth during a feed.

Cortisol and thyroid

Cortisol is a stress hormone. With a new baby, broken nights and constant alertness can keep it high, adding to that tired but wired feeling. Your thyroid can also shift in the postpartum year. If tiredness or changes in how you feel hang on for months, ask your doctor about it.

How postpartum hormone changes affect your mood

You might notice your feelings changing quickly: tender one minute, irritable the next. Falling hormones, especially estrogen and progesterone, a stretched nervous system and very little sleep all feed into it. Anxiety can show up as racing thoughts or feeling on edge, especially at night. A low mood can feel like a heavy, flat sadness.

These emotional shifts are real, and they're not a sign you're doing anything wrong. They're also only one part of the bigger change we describe in our article on the matrescence definition.

Physical signs of hormonal shifts

Postpartum hormonal shifts show up in your body as well as your emotions. Common symptoms include:

• hot flashes and night sweats
• shedding a few months in
• fatigue that a nap doesn't fully fix
• postpartum headaches or breast tenderness
• dry skin
• feeling foggy or forgetful

Postpartum night sweats and hot flashes

Night sweats are very common early on as your body clears extra fluid from pregnancy. Hot flashes can come and go while estrogen is low. If you have a fever or sweats with chills, call your midwife or family physician.

Hair loss and brain fog

Postpartum shedding can be alarming, but it's usually temporary as hormonal levels settle. Postpartum brain fog is common too, shaped by hormonal changes, sleep loss and the sheer amount you're holding in your head.

Baby blues, or something more?

The baby blues, sometimes called the postpartum blues, often start in the first week and ease within two weeks. This often shows up alongside hormonal ups and downs, and it usually passes with time and support.

If feelings get heavier or last longer, it may be postpartum depression or another concern. Watch for these symptoms:

• sadness or emptiness most days
• worry that keeps building
• losing interest in things
• pulling away from people
• trouble feeling close to your baby
• feeling hopeless or not like yourself

Your mental health deserves the same care as your postpartum healing.

How breastfeeding and weaning affect your hormones

While you're feeding at the breast, prolactin stays high and estrogen stays low, so some changes last longer. Milk flow also relies on oxytocin, which can make a feed feel soothing. Weaning brings its own hormonal shift. Some parents feel tearful or flat for a few weeks as feeding ends, then steadier. If your baby is formula fed, hormones often return to their usual rhythm sooner.

When do hormones level out?

For many women, hormones settle somewhere between the third and sixth month. Breastfeeding can stretch that to a year or more. The timeline is personal, and it's normal to feel ahead some weeks and behind others. If you're still struggling, it may simply mean your body and your baby's needs are still changing.

Caring for yourself while your postpartum hormone levels settle

You can't rush hormones, but you can make the postpartum months easier:

Rest when you can. Even lying down while the baby naps helps.

Eat regularly. Steady meals help you feel steadier.

Move gently. Light exercise, like a short walk, can ease tension once you've been cleared.

Get outside. Daylight helps your body find a rhythm.

Lean on your partner. Share night feeds and chores where you can.

Lower expectations. The postpartum stretch takes time, and good enough is enough.

Track how you feel. Notice patterns across the days.

Ask for help. Say yes to meals, visits and a break.

When to talk to your doctor

Talk to your doctor or another healthcare provider if fatigue, low spirits or anxiety last more than a few weeks, if you have sweats with a fever, or if something just doesn't feel right. You don't need to wait for your next postpartum check-up.

How postpartum support can help

In therapy, we can help you make sense of what you're feeling, separate what might be a postpartum hormone shift from what needs other kinds of care, and build steadier routines. We see postpartum parents in person and online, and you can start at any point in the first year or beyond.

Our next article on postpartum sleep deprivation looks at how broken nights affect your feelings and recovery, and what can help.