The gap vs. the function problem

When women are told they have diastasis recti, the focus almost always goes to the gap — its width, whether it's closing, whether it's "healed." This is the wrong measure. Current evidence from pelvic health physiotherapy research (Lee and Hodges, 2016; Groom et al., 2019) shows that what predicts symptoms and functional impairment is not gap width but linea alba tension — the ability of the connective tissue between the rectus abdominis muscles to generate and transfer force. A woman can have a 3-finger gap with excellent tension and full function. Another can have a 2-finger gap with poor tension and significant symptoms: back pain, pelvic girdle pain, inability to return to exercise, a feeling of abdominal weakness that doesn't respond to standard core work.

This matters practically because it means measuring the gap — whether with fingers or ultrasound — tells you less than you need to know. A physiotherapist assessing diastasis recti should also be assessing load transfer, intra-abdominal pressure management, and functional movement quality. That's a different assessment from counting centimeters.

100%
of women have some degree of inter-recti gap by 35 weeks of pregnancy — it is a normal mechanical adaptation to accommodate the growing uterus, not a complication. The question is whether it resolves postpartum and whether it causes functional problems in the meantime
39%
of postpartum women still meet the clinical threshold for diastasis recti at 6 months postpartum, falling to approximately 32% at 12 months — indicating spontaneous resolution in the majority, but suggesting that a significant minority require targeted rehabilitation
~3cm
The clinically accepted threshold for a pathological inter-recti gap (≥2 fingerbreadths or ≥2.5–3cm on ultrasound), though this definition is contested in recent literature — which increasingly emphasizes function over geometry as the relevant clinical measure

What actually helps — and what makes it worse

The exercises most consistently shown to worsen diastasis recti are those that generate high intra-abdominal pressure without adequate deep core engagement first. Traditional crunches and sit-ups, double-leg lowering, and heavy lifting with breath-holding are the main offenders. The mechanism is that these exercises bulge the linea alba outward under load, rather than drawing it inward — which over time can widen the gap and impair tension generation further.

What helps is progressive loading of the transversus abdominis and deep core stabilizers, starting at low loads and building systematically. Clinical pilates, targeted physiotherapy exercise programs, and progressive resistance training under guidance all have evidence supporting them. The key word is progressive — beginning with breathing and pressure management, moving to loaded exercises only as control is established. The old-fashioned approach of telling postpartum women to do only gentle exercises indefinitely was not supported by evidence and often prolonged recovery unnecessarily.

Research

Do abdominal binders and splinting help? Binders and abdominal splints are widely used postpartum to support the healing linea alba, but the evidence base is thin. A 2020 Cochrane review found insufficient evidence to recommend or discourage their use. Expert opinion from pelvic health physiotherapy suggests that passive support from a binder may help with early postpartum pain and load management but should not replace active rehabilitation — using a binder as a substitute for physiotherapy delays the strengthening process that actually resolves diastasis recti.

Getting the right help

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If you notice a visible doming or ridge along the midline of your abdomen when you sit up, this is a sign of diastasis recti with poor tension management. This is worth getting assessed by a pelvic health physiotherapist before returning to high-impact exercise, heavy lifting, or any abdominal exercise program. It's also worth knowing that diastasis recti is not dangerous — it's a functional issue, not a structural emergency — and the prognosis with appropriate rehabilitation is excellent for most women.

Medical Disclaimer: This article is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
Sources
  1. Lee D, Hodges PW (2016). Behavior of the linea alba during a curl-up task in diastasis rectus abdominis. Journal of Orthopaedic and Sports Physical Therapy, 46(7):580-589.
  2. Groom T et al. (2019). Diastasis rectus abdominis — a review of treatment, risk factors and long-term consequences. Journal of Association of Chartered Physiotherapists in Women's Health, 124:1-9.
  3. Mota P et al. (2015). Diastasis recti abdominis in pregnancy and postpartum period. Risk factors, functional implications and resolution. Current Women's Health Reviews, 11(1):59-67.
  4. Bø K et al. (2017). Exercise and pregnancy in recreational and elite athletes. British Journal of Sports Medicine, 50(10):571-576.
  5. Keeler J et al. (2012). Diastasis recti abdominis: a survey of women's health specialists for current physical therapy clinical practice for postpartum women. Journal of Women's Health Physical Therapy, 36(3):131-142.