Diastasis Recti: 30-Second Self-Test + What to Do Next

Six weeks postpartum, your obstetrician glances at your belly, says everything looks fine, and sends you home. Three months later, you still look five months pregnant. Your back aches. Sit-ups feel weird. Something pokes outward when you sit up in bed.

That something is probably diastasis recti, and roughly two out of three women have it at twelve weeks postpartum. The good news: most cases close on their own or with the right training within eight to twelve weeks. The catch: doing the wrong exercises will keep it open or make it worse, and a lot of standard fitness advice is wrong for this exact condition.

Let's start with the test.

The 30-Second Self-Test

You'll need to lie on your back with your knees bent, feet flat on the floor. Bare belly. A finger or two free.

Step one. Place two fingers horizontally on your midline, just above your belly button. Press in gently, about an inch deep, with the pads of your fingers (not the tips).

Step two. Lift your head and shoulders slightly off the floor, like the start of a crunch. Don't go all the way up. Just enough that you feel your abs engage. Keep breathing.

Step three. Notice what happens under your fingers. Are you feeling a firm wall on each side, with your fingers pinched between them? Or do your fingers sink into a soft gap, with the abs pulling apart on either side?

Step four. Repeat at the belly button itself, and again two inches below. The gap is often widest at or just above the navel.

That's the test. Now you grade it.

Grading Your Gap

Measure how many fingers fit width-wise across the gap, with the abs engaged.

Under one finger: no clinical diastasis. You're done with this article.

One to two fingers: mild. Common at six to twelve weeks postpartum. With consistent training, this typically closes within eight weeks.

Two to three fingers: moderate. Closeable with structured training over twelve to sixteen weeks. Worth booking one or two pelvic PT sessions to confirm form, especially if you also have lower back pain or pelvic heaviness.

Three-plus fingers, or the gap stays wide and shallow with no firm bottom under your fingers: significant. Don't try to self-coach this one. See a pelvic floor physical therapist. They'll assess depth (how far your fingers sink), tension across the linea alba (the connective tissue in the middle), and whether you have a hernia. Depth matters more than width for long-term outcomes, and you can't measure depth reliably on yourself.

Doming or coning under your fingers, where the midline pushes upward into a ridge when you lift your head, is also a flag. It means you're managing pressure poorly, regardless of gap width. The fix is the same training principles, but you need to be stricter about avoiding loaded flexion.

Why Sit-Ups and Crunches Make It Worse

Diastasis isn't just a gap. It's a connective tissue strain. The linea alba, the band that runs down your midline, has been stretched and weakened by nine months of pregnancy. Tension across that band depends on how the deep core, the diaphragm, the pelvic floor, and the obliques work together.

When you crunch, you contract the rectus abdominis (the six-pack muscle) and bow it outward. That outward force pulls the two halves of the rectus apart, and the linea alba can't push back yet. The result is increased tension across the gap with no resistance, which is exactly what makes the gap stay open.

5 Exercises to Skip Until You're Closed

Sit-ups, crunches, oblique twists, and any abs-on-the-floor curl-up variation. Including bicycle crunches.

Full planks, especially front planks held for time. The pressure stack is a problem when the linea alba can't manage it. Modified planks (knees down, short holds) can be okay later, but not in the first weeks.

Russian twists, especially weighted. Loaded rotation through an unstable midline is a quick way to widen the gap.

Double leg lifts, scissor kicks, hollow holds. Anything where both legs are off the ground at the same time multiplies intra-abdominal pressure with the worst possible lever.

Heavy overhead lifting without breath strategy. The press-and-hold-your-breath pattern most people default to under load is exactly what your abs can't handle yet. You can return to lifting; you just need to learn the breath pattern first.

A 2019 study in the Journal of Orthopaedic and Sports Physical Therapy compared traditional ab training against deep core and breath-based training in postpartum women and found the deep core group closed gaps faster and had less doming at twelve weeks. Specificity matters.

What Actually Closes the Gap

Three categories of work. Do them in this order.

First, breath and pressure management. Your diaphragm and pelvic floor have to start cooperating again. Lie on your back, knees bent, hand on lower ribs. Inhale and feel the ribs spread sideways and down. Exhale slowly and feel the lower belly draw inward toward the spine. The deep transversus abdominis fires last, gently. You're not sucking in. You're letting the air out and letting the connection happen. Five to eight breaths, two or three times a day.

If you've never felt your pelvic floor actively engage, start with where is my pelvic floor: how to find it and feel it working before progressing.

Second, deep core activation in unloaded positions. Heel slides, where you lie on your back and slowly slide one heel out and back, keeping your low back gently in contact with the floor. Bird-dogs at quarter range. Toe taps from a tabletop position, alternating, with breath. The rule for all of them: exhale on effort, no doming, no breath-holding. Two sets of eight to ten reps per side, daily.

Third, integrated functional work. Once you can hold deep core engagement through the heel-slide and toe-tap progressions for two to three weeks, you add gentle loading. Glute bridges with breath. Side planks from the knees, short holds. Squats with full breath cycle. The goal is to teach the core to manage real-life pressure: lifting a baby, climbing stairs, carrying groceries.

This is also the order most evidence-based postpartum programs use. Skipping the breath work and jumping straight to ab exercises is the most common mistake.

Realistic Timelines

With daily practice, here's what most women see.

Week one to four. The gap may not close yet, but doming reduces, breath patterns improve, and lower back pain often eases. Belly tone starts coming back even if the measurement hasn't changed.

Week four to eight. The gap measurably narrows for mild cases. You may go from two fingers to one. Strength and stability noticeably improve. Picking up the baby feels less like your back is doing all the work.

Week eight to twelve. Mild diastasis (one to two fingers at the start) typically closes or reaches under one finger by this point. Moderate cases (two to three fingers) reduce to one to two.

Week twelve to twenty. Moderate cases continue closing. Around twenty weeks of consistent training is realistic for most two-to-three-finger gaps to functionally close.

If you're past twelve months postpartum and the gap hasn't budged with home training, that's a signal to get hands-on assessment. Sometimes the issue is depth and connective tissue laxity rather than muscle strength, and a different approach is needed.

Things That Help Outside Training

Avoid getting up from lying down by sitting straight up. Roll to your side, push up with your arm. Every time. The crunch motion repeated dozens of times a day is a slow tax on the linea alba.

Watch how you carry your baby. Hip-to-hip carries, especially always on the same side, twist the pelvis and load the obliques unevenly. Switch sides. Use both arms when you can.

Check your posture when you stand. Many postpartum women stand with the pelvis tipped forward, ribs flared, belly pushed out. That stance puts constant outward pressure on the linea alba. Stack ribs over hips, soften the front of the chest, gentle awareness of the lower belly.

Be careful with constipation. Straining on the toilet is the same pressure problem as a sit-up, applied for longer. Hydration, fiber, and a small footstool to bring the knees above the hips usually fixes it.

When to Get Help

Book a pelvic floor physical therapist if any of these apply: gap over three fingers, deep gap with no firm bottom, doming you can't get rid of with breath work, lower back pain that isn't resolving, leaking with cough or sneeze that hasn't improved at twelve weeks, or any sense of heaviness or pressure in the vagina or rectum.

In most countries this is one to three sessions, not an ongoing commitment. The information you get is worth far more than the cost.

What Comes Next

Diastasis is one piece of a larger postpartum recovery. Your pelvic floor, deep core, and breath system all retrain together. Once your gap is closed and pressure management is solid, you can progress to harder strength work. Many women find they're stronger at twelve months postpartum than they were before pregnancy, because the rebuild forced them to learn things they never knew about their core.

The path is slow. The gains are real. Skip the crunches.