Why Does Postpartum Recovery Start With… Breathing?

Diaphragmatic breathing is step one of postpartum core recovery. A physiotherapist explains the 3-D "core canister" and how to practise it.

If you've looked into postpartum recovery at all, you've probably noticed something odd: every physiotherapist-designed program seems to start with… breathing.

Not crunches. Not planks. Not even Kegels. Breathing.

If your reaction is "I've been breathing my whole life — I want my core back," this article is for you. Because diaphragmatic breathing isn't a warm-up or a wellness nicety. From a physiotherapy perspective, it's the mechanical foundation the rest of your recovery is built on. Here's why.

What is the "core canister"?

Picture your torso as a 3-D pressurized canister:

• The lid is your diaphragm — the dome-shaped breathing muscle under your ribs.
• The base is your pelvic floor — the muscular hammock at the bottom of your pelvis.
• The walls are your deep abdominals (transversus abdominis) wrapping around like a corset, and the small deep back muscles behind.

These four don't work as separate muscles — they work as one pressure system. When you inhale, the diaphragm descends, and a healthy pelvic floor lengthens to accept that pressure. When you exhale, everything recoils back up and in. Lid and base move together, like a piston, thousands of times a day.

Every "core exercise" you'll ever do depends on this canister managing pressure well. Which is exactly what pregnancy disrupts.

What does pregnancy do to your breathing?

By the third trimester, your growing baby has physically displaced the system:

• Your diaphragm gets pushed upward and can't descend fully, so many moms become shallow "chest breathers."
• Your ribs flare outward to make room, changing the diaphragm's resting position.
• Your abdominal wall lengthens dramatically, and your pelvic floor spends months under sustained load.
• The coordination between lid, walls, and base — the timing that made your core automatic — gets scrambled.

After birth, this doesn't simply snap back. The parts are all still there, but the system is out of sync. That's one big reason you can be "cleared" at 6 weeks and still feel weak, disconnected, or leaky — a theme we've explored in "Cleared for Exercise" — But Now What?.

How does breathing actually rebuild your core?

Diaphragmatic breathing is how you re-teach the canister to work as a team:

1. It restores the piston. Full 360° breaths get the diaphragm descending and the pelvic floor lengthening-and-recoiling again — pressure management, retrained on every breath.
2. It wakes up the deep abdominals gently. On a slow exhale, the transversus abdominis naturally engages — a low, safe load your healing tissues can handle from very early on.
3. It retrains timing, not just strength. Most postpartum core problems are coordination problems first. Breathing is coordination practice. (It's also why Kegels alone often don't fix leaking— a pelvic floor that can't relax and time itself with the breath won't behave, no matter how "strong" it is.)
4. There's research behind it. Studies in postpartum women have found breathing-based exercise programs can meaningfully improve pelvic floor muscle strength and endurance — the base of the canister responds to the lid.
5. It calms your nervous system. Slow diaphragmatic breathing activates the parasympathetic "rest and repair" state — no small thing in the sleep-deprived fourth trimester.

How do I practise diaphragmatic breathing? (Step by step)

As general education, here's the version many people find helpful:

1. Set up: lie on your back with knees bent, or recline against pillows. Relax your belly — no sucking in.
2. Hands on your lower ribs, fingertips at the front, thumbs toward the sides.
3. Inhale slowly through your nose and aim the breath into your hands: ribs expanding forward, sideways, and into the floor behind you — 360 degrees, not just the belly rising.
4. Let the pelvic floor go along for the ride. On the inhale, imagine it softening and lengthening. No pushing — just permission to relax.
5. Exhale slowly through pursed lips, like fogging a mirror. Feel the ribs knit back down and in, and notice the gentle, automatic tension low in your abdomen.
6. Repeat for 3–5 minutes, once or twice a day. Later, pair the exhale with effort — exhale as you lift the car seat, stand from the couch, or pick up your baby. "Blow before you go."

Gentle breathing like this can usually be started very early postpartum — often within days of birth — as long as you're comfortable and your healthcare provider hasn't advised otherwise.

When is breathing alone not enough?

Breathing is the foundation — it isn't the whole house. Once the canister is coordinating again, your body needs progressive load to rebuild real strength: deep core work, resistance training, and eventually impact if you want to return to running. Think of breathing as step one of six, not the entire plan.

And if breathing practice is derailed by symptoms — pain, pelvic heaviness, leaking that isn't improving, or a belly that domes with every effort — that's a sign to get individually assessed by a licensed pelvic-health provider in your area. Symptoms like these are common and very treatable with the right help.

Frequently asked questions

Written by Harleen Kalra, registered physiotherapist (BC, Canada).

This article is general education from a physiotherapist's perspective. It is not individualized physiotherapy advice, does not create a therapist-patient relationship, and is not a substitute for care from a licensed healthcare provider in your area. Harleen Kalra is a physiotherapist registered in British Columbia, Canada. For personalized assessment and treatment, please see a licensed pelvic-health provider where you live.