Nobody can promise you a flat midline. Here is what you can actually influence.
Abdominal separation is a normal adaptation to a growing uterus, not a failure of effort. But how you breathe, lift and load through pregnancy still matters.
Quick answer
No, you cannot reliably prevent diastasis recti during pregnancy, and any program that promises prevention is overselling. Widening of the linea alba is a normal, expected adaptation to a growing uterus, and it happens to a large share of women regardless of fitness. What you can influence is how well you manage pressure and load: breathing that moves the ribs, avoiding repeated doming or coning along the midline, skipping crunch-style flexion in later pregnancy, and learning to get in and out of bed by rolling. Those habits will not guarantee a smaller gap, but they make the postpartum rebuild easier.
already had abdominal separation at gestation week 21 (Sperstad et al., British Journal of Sports Medicine, 2016)
had it at six weeks postpartum, the peak point in that cohort
still had it at twelve months postpartum, showing how much resolves on its own and how much does not
Why separation happens in the first place
The linea alba is the band of connective tissue joining your left and right abdominal muscles. As the uterus grows, that band lengthens and thins. Cleveland Clinic describes this widening as a normal consequence of pregnancy rather than a muscle tear, and it is why the condition is measured as a distance between muscle bellies rather than as damage.
Hormonal changes across pregnancy also increase tissue laxity. Combine growing volume with softer connective tissue and separation becomes, for many women, simply what happens. That framing matters, because mums are frequently sold prevention as though separation were a punishment for the wrong exercises.
week 21
33.1%
postpartum
60%
postpartum
45.5%
postpartum
32.6%
Source: Sperstad et al., British Journal of Sports Medicine, 2016.
Read that first bar carefully. A third of women in that cohort already had separation halfway through pregnancy. Prevention advice aimed at the third trimester is arriving after the process has begun for many mums.
What the evidence does and does not support
There is no exercise protocol with strong evidence that it prevents diastasis recti. Reviews of the area consistently note small studies, inconsistent measurement methods and disagreement about what even counts as a separation, since the threshold used varies between researchers. That is an honest limitation, not a gap we should paper over with confident marketing.
What is better supported is the general case for staying active. ACOG recommends at least 150 minutes of moderate-intensity aerobic activity per week during pregnancy and the postpartum period for people without contraindications, and RANZCOG gives comparable guidance. NICE in the UK recommends pelvic floor muscle training during pregnancy to reduce the risk of urinary incontinence, and the NHS advises pelvic floor exercises throughout pregnancy. None of those recommendations are framed as separation prevention, and it would be dishonest to present them that way. They are worth doing on their own merits.
Habits that genuinely help, even if they do not prevent
Breathe into your ribs, not just your belly
Pressure inside the abdomen has to go somewhere. Breathing that expands the lower ribs distributes it, whereas breath-holding drives it forward into the midline and down onto the pelvic floor.
Watch for doming and coning
A ridge or a dip along the centre of your abdomen when you sit up or exert yourself is a signal to change the movement, not to push harder. We break down what the two look like in coning versus doming.
Roll to get out of bed
Sitting straight up from lying is the single most repeated crunch most pregnant women perform. Roll to your side, then push up with your arms.
Skip loaded flexion later in pregnancy
Sit-ups, crunches and full planks are usually modified out as the bump grows. The reasoning is the same one that applies afterwards, which we cover in why crunches can make a belly pooch worse.
Lift like you will have to do it a thousand more times
Exhale on effort, keep the load close, and do not brace so hard that your whole trunk goes rigid. Toddlers, shopping and car seats are the real training load of pregnancy.
The honest verdict
Treat prevention as a hopeful side effect, never as the goal. Aim instead for arriving at birth with good breathing mechanics, an aware pelvic floor and no habit of pushing through doming. Mums who arrive that way tend to find the early postpartum work more intuitive, which matters because that is where the real rebuilding happens. Results vary from mum to mum.
What to do after the birth
Once your baby arrives, the question changes from managing a stretching abdominal wall to rebuilding one. That shift, and which type of program suits which stage, is laid out in our comparison of pregnancy core programs versus postpartum core programs.
Before you start anything structured, it is worth knowing where you actually are. Our at-home self-check walks through how to feel for width and, more importantly, tension. If you want the broader numbers on how common all of this is, see our postpartum diastasis recti statistics page.
For the rebuilding part, afterwards
When you are ready to start reconnecting, Core Reconnect is a one-time, no-subscription guide you own outright, built as the affordable alternative to programs like MUTU. Use code GLOW20 for 20% off. It is general education, not a substitute for individual care, and results vary from mum to mum.
Frequently asked questions
Does being fit before pregnancy prevent diastasis recti?
It does not appear to be protective on its own. Sperstad and colleagues found separation across a broad cohort, and it occurs in women who were active before conceiving. Fitness helps with strength, stamina and recovery, but it is not a shield against a normal adaptation.
Do belly bands or support garments prevent separation?
There is no good evidence that they prevent it. Some mums find a support band helpful for comfort or pelvic girdle pain late in pregnancy, which is a reasonable reason to use one, but comfort and prevention are different claims.
Are planks safe during pregnancy?
It depends on the person and the trimester. Many mums modify to an incline or drop them entirely once the bump makes it hard to hold position without doming. If you see a ridge along the midline or feel pressure downward, change the exercise.
Does having a second or third baby make it more likely?
Repeat pregnancies are commonly discussed as a factor, and the abdominal wall has less time to recover between them. That is about likelihood, not certainty, and it does not mean a later rebuild will fail.
Should I see anyone during pregnancy about this?
If you have pain, leaking, a feeling of heaviness in the pelvis, or you notice pronounced doming during ordinary movement, a women's health physiotherapist is the right person to see, and many can be seen while you are still pregnant.
can you prevent diastasis recti during pregnancy
Sources: Sperstad JB et al., Diastasis recti abdominis during pregnancy and 12 months after childbirth, British Journal of Sports Medicine, 2016; American College of Obstetricians and Gynecologists, Physical Activity and Exercise During Pregnancy and the Postpartum Period; RANZCOG, Exercise during pregnancy; NICE guideline NG210, Pelvic floor dysfunction: prevention and non-surgical management; NHS, Pelvic floor exercises; Cleveland Clinic, Diastasis Recti.
This article is general education, not medical advice. Mumma Glow is not affiliated with MUTU System or any other program named here. Results vary from mum to mum. Please see your GP, midwife, obstetrician or a women's health physiotherapist for advice about your own pregnancy and recovery.