Relaxin After Birth: Why Your Body Still Feels Unstable Months Postpartum

The first few days after birth get a lot of attention. The hormone drop. The night sweats. The crying over a sandwich because it suddenly feels very meaningful.

But that early hormone shift is not the whole story.

One hormone in particular, relaxin, can hang around and affect the body much longer than many people expect. And if returning to workouts, walks, lifting, running, or even daily movement feels weirdly unstable months postpartum, relaxin may be part of the reason.

Not the only reason. Postpartum recovery is layered. But it is a big piece that often gets skipped.

Postpartum recovery is often slower and less linear than expected.

Relaxin does more than help during birth

Relaxin is one of the hormones that helps the body make room for pregnancy and birth. It allows ligaments and connective tissue to become more flexible, especially around the pelvis.

That is useful when the body is growing a baby and preparing for delivery.

The tricky part is that relaxin does not clock out the second the baby arrives.

People often hear about the big hormone crash in the first few days postpartum, and yes, that is real. Estrogen and progesterone drop quickly after the placenta is delivered. That can bring mood swings, sweating, tender emotions, and all the “what is happening to my body” feelings.

But relaxin is different. It can stay active in the body for months postpartum. A common guideline is that relaxin may remain present until around 6 months postpartum or until breastfeeding ends, whichever is longer.

That means someone who is nursing or pumping may feel the effects well past the newborn stage.

This is why “I’m 4 months postpartum, why do I still feel wobbly?” is not a silly question. It is a very normal one.

Why the body can feel unstable months later

Relaxin affects connective tissue. Think ligaments, joints, and the support structures that help the body feel held together.

When those tissues are more lax, the muscles have to work harder to create stability. That can show up in everyday life, not just workouts.

You might notice:

• A wobbly feeling in the hips, knees, ankles, or pelvis

• Trouble feeling grounded during squats or lunges

• A sense that your core is not “online” yet

• Low back or pelvic discomfort after activity

• Feeling strong one day and loose or achy the next

• Joints that click, slip, or feel less predictable

  
  

This can be frustrating because the workout may actually be working. The muscles may be rebuilding. Strength may be returning.

But if the connective tissue is still influenced by relaxin, the body may not feel fully stable yet.

That gap can mess with your head. It can feel like you are failing, when really your body is still under the influence of a hormone designed to create looseness and mobility.

Stability can feel different while relaxin is still affecting the body.

Your body is not broken because it changed shape

There is also the body image part, which deserves honesty.

Pregnancy changes the body’s shape. Rib cages expand. Hips may feel different. The belly, core, pelvic floor, breasts, posture, and even foot size can change. Some things shift back. Some things do not. Some things settle into a new version.

That does not mean the body is ruined.

It means the body has entered its mother era, and it may not return to a “maiden” form because that was never the assignment after birth.

This matters because a lot of postpartum fitness messaging quietly sells the idea that bouncing back is the goal. But many people are not actually dealing with a motivation problem. They are dealing with a body that has been structurally and hormonally altered.

Trying to force the old routine onto a body that is still loose, healing, feeding a baby, sleeping poorly, and carrying more daily physical load can feel awful.

The better goal is not to punish the body back into its old shape. The better goal is to rebuild trust with the body you have now.

Returning to workouts may need a slower ramp

If an old workout suddenly feels off, the answer is not always to stop moving. Movement can be helpful. Strength work can be helpful. Walking, mobility, breathwork, and core rehab can all support recovery.

The key is to respect the stability piece.

During the postpartum months, especially while relaxin is still present, it may help to focus on:

• Controlled strength instead of speed

• Good alignment instead of heavy weight

• Shorter workouts instead of pushing through fatigue

• Core and pelvic floor coordination

• Low-impact cardio before jumping or running

• Rest days without guilt

A regular clearance at a 6-week checkup does not always mean the body is ready for every activity. It often means basic healing is on track. That is different from being ready to sprint, lift heavy, jump rope, or return to high-intensity training.

Signs you may need more support

Some discomfort and awkwardness can be normal during the return to movement. Sharp pain, pressure, leaking, or a heavy dragging feeling are worth paying attention to.

Consider getting professional support if you notice:

• Pelvic pressure or heaviness

• Leaking urine during exercise, coughing, or sneezing

• Pain in the pelvis, hips, back, or pubic bone

• A bulging or doming feeling in the abdomen

• A feeling that joints are slipping or unstable

• Pain that gets worse after workouts instead of improving

  
  

None of these mean anything is “wrong” with you as a person. They are signals. The body is asking for a different kind of support.

This post is for general education only and is not medical advice. For personal guidance, check in with a qualified healthcare professional, especially if pain, pressure, bleeding, dizziness, or pelvic symptoms show up.

Give yourself the longer timeline

The hard part about postpartum recovery is that life often speeds up before the body is finished healing.

The baby gets heavier. The car seat gets heavier. Laundry keeps happening. Everyone asks if things are “back to normal.”

Meanwhile, your body may still be dealing with relaxin, sleep disruption, feeding demands, scar healing, tissue recovery, core changes, and a nervous system that barely gets a quiet minute.

So if you are months postpartum and still feel unstable, that does not automatically mean your workouts are pointless. It may mean your body is still waiting for the hormone picture and connective tissue support to settle.

Tracking symptoms and movement can make postpartum recovery feel less mysterious.

Here is the gentler reframe: progress may be happening before it feels solid.

Strength can return before stability feels automatic. Fitness can improve before joints feel predictable. The body can be healing even when it does not feel like the old version.

Relaxin after birth is one reason the timeline can be longer than expected. Give the body room to rebuild from the inside out, not just shrink from the outside in.