Diastasis recti gets most of the postpartum core conversation, but plenty of new mothers notice something different — the ribs themselves feel wider, like a shirt that used to close now sits open at the bottom. This is rib flare, a related but distinct issue, and it rarely gets mentioned in the standard postpartum core advice. Here is why it happens, how to tell if you have it, and what actually helps. This is general information, not medical advice.

Why Rib Flare Happens Alongside Diastasis Recti

The mechanical connection: the the-growing-uterus-pushes-outward-and-upward (the expanding uterus not just stretching the abdominal wall but also pushing the lower ribs outward as pregnancy progresses — the it’s-not-just-a-belly-issue), the the-same-connective-tissue-softening (the same pregnancy hormones that soften the linea alba, per the diastasis-recti-safe-moves logic, also softening the cartilage connecting the lower ribs — the shared-hormonal-cause), the the-compensatory-breathing-pattern (the growing belly pushing breathing higher into the chest, training the rib cage into a more flared resting position over months — the breathing-pattern-reinforces-the-shape), the the-posture-during-late-pregnancy (the leaning back to counterbalance belly weight subtly changing rib cage position, a habit that persists postpartum — the compensation-outlives-the-pregnancy), the the-often-coexists-with-diastasis (the two conditions frequently occurring together since they share root causes, though either can happen without the other — the related-but-not-identical), and the reframe (the rib flare as a structural, mechanical shift alongside diastasis, not a separate mystery problem or a sign of poor healing).

How to Tell If You Have It

A simple self-check: the the-visual-check (the standing relaxed and noticing if the lower ribs visibly jut outward rather than sitting flush with the torso — the look-for-the-flare-shape), the the-hand-check (the placing hands along the lower rib edges and noticing an outward flare angle rather than a smoother taper — the feel-the-angle), the the-bra-and-shirt-fit-clue (the underbust measurements or shirt hems fitting differently than pre-pregnancy despite overall weight returning to baseline — the clothing-fit-is-a-clue-not-a-diagnosis), the the-breathing-pattern-check (the noticing breath moving mostly into the upper chest and rib flare rather than expanding the lower ribs and belly evenly — the where-your-breath-goes-matters), the the-its-common-not-universal (the not every postpartum body developing noticeable rib flare, and its absence isn’t a sign anything is wrong either — the presence-and-absence-are-both-normal), and the frame (the self-check as visual, hands-on, and breath-pattern observation together — a simple starting point, though a pelvic floor or postpartum-specialized physical therapist gives a far more precise read).

The Specific Moves That Help Close It Back Down

What actually helps: the 360-degree-breathing-practice (the practicing breath that expands the ribs sideways and back, not just the front, retraining the rib cage’s resting position — the retrain-the-breath-first), the the-avoid-rib-thrusting-postures (the consciously softening the tendency to arch and thrust the ribs forward during standing and exercise — the awareness-changes-the-default), the the-serratus-and-oblique-activation (the exercises that engage the muscles wrapping around the side ribs, gently drawing them back toward the midline over time — the target-the-muscles-that-anchor-the-ribs), the the-avoid-heavy-front-loaded-core-work-early (the crunches and sit-ups potentially reinforcing the flared pattern before the connective tissue and muscles have reorganized, echoing the rebuild-core-after-birth caution — the wrong-exercise-too-early-can-reinforce-it), the the-patience-with-the-timeline (the rib position often taking many months to noticeably shift, sometimes alongside diastasis healing rather than ahead of it — the same-slow-timeline-as-the-rest-of-core-recovery), and the frame (the moves as 360-degree breathing, postural awareness, targeted oblique and serratus work, and avoiding front-loaded core exercises too early — closing the ribs is a breathing and awareness project as much as a strength one. This is general information, not medical advice.)

Postpartum rib flare — the lower ribs sitting visibly wider than they used to — happens for reasons closely related to diastasis recti: the growing uterus pushes the rib cage outward as much as it stretches the abdominal wall, and the same pregnancy hormones that soften the linea alba also soften rib cartilage, while months of higher chest breathing train the ribs into a flared resting position that persists after birth. A simple self-check involves looking and feeling for an outward angle along the lower rib edges and noticing where breath naturally goes, though a postpartum-specialized physical therapist gives a far more precise read. What actually helps is retraining breath to expand the ribs sideways and back rather than just up, building postural awareness against rib thrusting, targeting the oblique and serratus muscles that anchor the ribs, and avoiding heavy front-loaded core work before those systems reorganize. Like the rest of postpartum core recovery, closing the ribs back down is a slow, breath-and-awareness-driven project rather than a quick fix. This is general information, not medical advice.

See It in Motion

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