How to Check for Diastasis Recti: Finger Test & Gap Guide

What is Diastasis Recti?

Diastasis Recti is the separation of the rectus abdominis muscles (the “six-pack” muscles that run vertically down the front of the abdomen) along the midline of the body. The two sides of the muscle separate, widening the linea alba (the connective tissue that runs between them).

It happens because the growing uterus during pregnancy places significant pressure on the abdominal wall, causing the muscles to stretch and separate to accommodate the baby. To some degree, this happens in every pregnancy. It’s not a failure of the body; it’s the body doing exactly what it needs to do to grow a baby.

The question is not whether separation happened, but whether it has resolved adequately after birth, and whether the connective tissue has regained enough tension to support the core properly.

Who Gets Diastasis Recti?

The short answer is: most pregnant women, to some degree.

Research suggests that around two thirds of women have some degree of Diastasis Recti in the third trimester of pregnancy. For many, the gap closes naturally in the weeks and months after birth. For others, it persists and requires specific rehabilitation to address.

Factors that can increase the likelihood of a more significant or persistent diastasis include:

• Multiple pregnancies
• Carrying a large baby or multiples
• Carrying a lot of fluid during pregnancy
• A history of abdominal surgery (including cesarean section)
• Returning to high-impact or high-pressure exercise too soon after birth
• Genetics (some women’s connective tissue is naturally more lax than others)

It’s also worth knowing that Diastasis Recti is not exclusively a postnatal condition. It can occur in men, in women who have never been pregnant, and in people who have placed significant repeated pressure on the abdominal wall through heavy lifting or certain types of training. That said, the vast majority of women who come to me with Diastasis Recti are postpartum, and that is the context I’ll focus on here.

Signs You Might Have Diastasis Recti Before You Check

Before we get into the self-check, it’s worth knowing what Diastasis Recti can feel and look like. Many women have it without realising, particularly if they haven’t been told what to look for.

A visible “mummy tummy” or doming
When you sit up from lying down, or during any exertion, you may notice a ridge or dome shape appearing along the midline of your abdomen. This is one of the most recognisable signs of Diastasis Recti and happens because the connective tissue isn’t providing adequate support to hold the abdominal contents in place.

A feeling of core weakness that doesn’t improve
If you’ve been exercising consistently but your core still feels weak, unstable, or disconnected, Diastasis Recti may be part of the reason. The separation means the deep core muscles can’t function as an integrated unit, which affects everything from lifting to posture to simply feeling strong in your body.

Lower back pain
The core and the lower back work together as a support system. When the core is compromised by Diastasis Recti, the lower back often compensates, leading to persistent pain or discomfort.

A feeling of heaviness or pressure in the pelvis
Diastasis Recti and pelvic floor dysfunction frequently coexist. The two are part of the same core system, and when one is compromised, the other is often affected too.

Bloating that seems disproportionate
Many women with Diastasis Recti notice that their abdomen appears more distended or bloated than they’d expect, particularly as the day goes on. This is related to the reduced support the abdominal wall is providing to the digestive organs.

If several of these resonate with you, it’s worth doing a self-check. And if you’re not sure, it’s always worth checking anyway.

When to Do the Diastasis Recti Test (and When to Wait)

If you’ve recently given birth, timing matters.

In the immediate postpartum period (the first six to eight weeks), the body is still in active recovery. The linea alba is still healing, and a Diastasis Recti test at this stage won’t give you an accurate picture of where things will settle. More importantly, the information you get in those early weeks can cause unnecessary anxiety about a gap that may well close on its own.

My recommendation is to wait until at least six to eight weeks postpartum before doing a Diastasis Recti test after pregnancy. If you’ve had a cesarean section, I’d suggest waiting a little longer and checking in with your midwife or GP before doing any abdominal assessment.

If you’re further along in your postnatal journey (months or even years after birth) and are wondering whether Diastasis Recti might be relevant to you, there’s no reason to wait. The self-check is simple, takes a few minutes, and gives you genuinely useful information.

How to Check for Diastasis Recti at Home: Step-by-Step Finger Test

This is something you can do yourself, at home, with no equipment. Here’s how to do the Diastasis Recti finger test properly.

Step 1: Get into position
Lie on your back on a firm surface (a yoga mat on the floor is ideal). Bend your knees and place your feet flat on the floor, hip-width apart. Take a moment to relax your abdomen completely.

Step 2: Locate the midline
Place the fingertips of one hand horizontally across your abdomen, just above your belly button. You’re looking for the midline of the body, which runs vertically from your sternum to your pubic bone.

Step 3: Create a gentle contraction
Slowly lift your head and shoulders just slightly off the floor (as if you’re beginning a very small crunch). Don’t strain or hold your breath. This gentle contraction brings the rectus abdominis muscles towards the midline and makes any gap easier to feel.

Step 4: Feel for the gap
With your fingertips, gently press down into the midline. You’re feeling for a gap between the two sides of the muscle. Move your fingers slowly, checking both above and below the belly button, as the gap can vary in width at different points along the midline.

Step 5: Measure the Diastasis Recti finger gap
Note how many fingers fit into the gap. One finger width is generally considered within normal range. Two finger widths is borderline. Two and a half finger widths or more is typically classified as Diastasis Recti. Take note of the measurement both above and below the belly button, as the gap can differ at each location.

Step 6: Check the tissue tension
This is the part that often gets missed, and it’s just as important as measuring the Diastasis Recti gap. With your fingers in the gap, notice how much resistance you feel. Can you press your fingers in deeply without much resistance? Or does the tissue feel firm and springy? Weak, soft connective tissue (even with a smaller gap) can be just as significant as a wider gap with good tension.

Step 7: Check below the belly button
Many women focus only on the area above the belly button, but the gap can be present (and sometimes more significant) below it. Repeat the same process a few centimeters below the navel.

Understanding Your Gap Width: Diastasis Recti Degrees and Classification

These are the two things that matter most when assessing Diastasis Recti, and it’s important to understand both.

Gap Width and Classification

The width of the gap is measured in finger widths and is used to classify the degree of Diastasis Recti. Here is a general guide:

It’s worth knowing that these classifications are a guide rather than a rigid diagnostic framework. What matters most is how the core system is functioning as a whole, not just the number of fingers that fit in the gap.

Tissue Tension

The tension (or lack of it) in the connective tissue is equally important as gap width. A woman with a two-finger gap but poor tissue tension may have more functional impairment than a woman with a three-finger gap but good, springy tension in the linea alba. What we’re really assessing is whether the connective tissue can do its job of supporting the abdominal contents and transferring load across the midline.

This is why I always encourage women to pay attention to both measurements, and why a self-check, while useful, is best followed up with a proper assessment from a women’s health physiotherapist who can give you a more complete picture.

Diagnosing Diastasis Recti: Self-Check vs Professional Assessment

A self-check at home gives you a useful starting point, but diagnosing Diastasis Recti properly involves more than counting finger widths.

A women’s health physiotherapist can assess the full length of the linea alba (not just above and below the belly button), measure tissue tension with greater accuracy, assess how the whole core system is functioning under load, and identify whether there are any related issues (pelvic floor dysfunction, hypertonic transverse abdominis, or prolapse) that need to be addressed alongside the diastasis.

What I always say to the women I work with is this: the self-check tells you whether it’s worth investigating further. The professional assessment tells you exactly what you’re working with and gives you a clear, personalized starting point for rehabilitation.

If your self-check suggests a gap of two and a half finger widths or more, or if you have poor tissue tension regardless of gap width, a professional assessment is genuinely worth prioritizing.

What to Do Next

Once you’ve done your self-check, here’s what I’d recommend:

If you have a significant gap or poor tissue tension: Book an assessment with a women’s health physiotherapist. A self-check gives you useful information, but a professional assessment gives you a complete picture and a clear starting point for rehabilitation.

Start a low-pressure rehabilitation programme: Traditional core exercises (crunches, sit-ups, planks, heavy lifting) are not appropriate for Diastasis Recti and can make things worse. What you need is a programme that rebuilds core strength from the inside out, without increasing intra-abdominal pressure. This is exactly what Hypopressives are designed to do.

Be patient with yourself: Diastasis Recti rehabilitation takes time. The connective tissue heals slowly, and meaningful change happens over months rather than weeks. Consistency matters far more than intensity here.

Know that it is never too late: I work with women who are years, sometimes decades, postpartum and still see meaningful improvement. The body’s capacity to heal and adapt is genuinely remarkable when given the right conditions.

Diastasis Recti and a Hypertonic Transverse Abdominis: When They Coexist

Something I see fairly regularly in postpartum women is a combination of Diastasis Recti alongside a hypertonic (overly tight) transverse abdominis. On the surface this might seem contradictory; how can the core be both separated and too tight? But it makes a lot of sense when you understand what’s happening.

When the linea alba is weakened and the core system loses its integrity, the body often compensates by increasing tension in the surrounding muscles (including the transverse abdominis). This is a protective response; the body is trying to create stability through tension because the connective tissue isn’t providing it. The result is a transverse abdominis that is chronically braced rather than functioning dynamically as part of the core system.

This matters enormously for rehabilitation, because the standard advice for Diastasis Recti (draw the belly button in, engage the core) can actually reinforce this pattern of chronic bracing rather than resolving it. What these women need is not more engagement but better coordination; teaching the deep core muscles to work together dynamically rather than simply holding on for dear life.

This is one of the reasons Hypopressives are so well suited to this presentation. Rather than cueing deliberate contraction, the Apnea technique creates an involuntary response that works with the body’s natural pressure management system. Over time, this helps to restore genuine coordination between the transverse abdominis, the pelvic floor, and the diaphragm, without reinforcing the compensatory bracing patterns that can keep women stuck.

If this sounds familiar, it’s worth mentioning to your physiotherapist and exploring whether a low-pressure approach like Hypopressives might be more appropriate for you than traditional core rehabilitation.

How Hypopressives Help with Diastasis Recti

Hypopressives are a system of breathing exercises and body positions that work by lowering intra-abdominal pressure and building core strength from the inside out. This makes them particularly well suited to Diastasis Recti rehabilitation.

The Apnea breathing technique creates a vacuum effect in the abdominal cavity, which activates the deep core muscles (particularly the transverse abdominis and pelvic floor) without placing downward or outward pressure on the linea alba. Over time, this helps to restore the functional integrity of the core system, improving both the tension in the connective tissue and the coordination of the deep core muscles.

Unlike traditional core exercises, Hypopressives don’t ask the rectus abdominis to work in a way that pulls the two sides of the muscle further apart. Instead, they work with the body’s natural pressure management system to create the conditions for the linea alba to heal and strengthen.

What I see in practice is that women who combine Hypopressives with diastasis-focused Pilates work and appropriate lifestyle modifications (managing intra-abdominal pressure in daily life, avoiding straining, breathing well) make significantly more progress than those who rely on traditional core exercise alone.

The doming or coning that many women notice during exertion also tends to reduce over time with consistent Hypopressives practice, which is one of the most encouraging signs of progress.

Getting Started

The most important first step is learning the Apnea breathing technique properly. It’s the foundation of everything, and getting it right from the start means you’ll get so much more from every session.

Each week I run live Fundamentals sessions on Zoom where I walk you through the technique step by step and give you individual feedback. Some women find it comes quickly; others (particularly those who are tighter through the ribs and thoracic spine) take a little longer.

The golden rule: three sessions of 15 to 20 minutes a week, done consistently. That is where the real change happens.

A Final Word

Finding out you have Diastasis Recti can feel overwhelming, particularly if you’ve been struggling with symptoms for a while without understanding why. But I want you to know that this is one of the most treatable conditions I work with, and the results I see in the women I support are consistently encouraging.

Your body is not broken. It grew a baby, and it adapted to do that. What it needs now is the right kind of support to rebuild. With the correct approach, real improvement is possible, regardless of how long it has been or how significant the separation feels right now.

If you’d like support getting started, I’d love to hear from you. You don’t have to figure this out alone.