What Is Postpartum Abdominal Muscle Separation (Diastasis Recti)?
What causes the separation felt at the midline of the belly after childbirth (diastasis recti), does it heal on its own, and how to check for it at home. When physiotherapy is needed and which exercises to avoid.
Short answer: Diastasis recti happens when the connective tissue (linea alba) linking the two abdominal muscle groups thins and widens during pregnancy. After delivery it generally improves noticeably on its own, though it doesn't always close completely. It's not a hernia, and it can be managed with the right approach.
What Is It and Why Does It Happen?
The linea alba is the connective tissue running vertically down the middle of the abdomen that joins the left and right rectus abdominis muscles. During pregnancy, the constant stretching from the growing uterus causes this tissue to thin and widen. Hormones released during pregnancy — estrogen, progesterone, and relaxin — also loosen collagen in connective tissue, making this stretching easier. In women who aren't pregnant, this connective tissue below the navel typically measures 15mm or less; with diastasis, that width increases noticeably.
An important distinction: diastasis recti is not a true abdominal hernia. A hernia involves an actual tear in the fascial layer with a sac that organs can enter; with diastasis, the muscle-fascia tissue stays intact — it's just thinned and widened.
Who Is More Likely to Have It?
- Multiple pregnancies (twins, triplets)
- A large baby or excess amniotic fluid
- Having given birth more than once (multiparity)
- Weak core muscle tone before pregnancy, or conditions that raise abdominal pressure like chronic constipation or a severe cough
- Older maternal age
Does It Heal on Its Own After Birth?
After delivery, as pregnancy hormones drop and the uterus shrinks back down, the abdominal wall tissues start to recover, and most cases show noticeable improvement over time. The fastest recovery happens in the first 6-8 weeks after birth, but the connective tissue can take 6 months to a year to fully remodel. In some cases where tissue elasticity doesn't recover enough, the separation can remain permanent.
How Can You Check at Home?
Lie on your back on a firm surface with your knees bent and feet flat on the floor. Support your head with one hand; place two fingers of the other hand a few centimeters above your navel. Lift your head and shoulders slightly to engage your abdominal muscles, and feel for the gap between the two muscle edges with your fingers. A gap of two finger-widths (about 2cm) or more points to diastasis recti. A vertical bulge or doming down the midline of the belly is another sign to watch for.
When Is Physiotherapy or Surgery Needed?
If the gap is around 2-3 finger-widths, or muscle weakness is the main issue, physical therapy and core rehabilitation are the first-line approach. Light exercise can typically begin once pain subsides after a vaginal delivery, while a wait of about 6 weeks is usually recommended after a C-section to let the abdominal wall heal.
If the separation is wide (generally over 3-4cm), hasn't closed despite consistent physiotherapy for at least 6-12 months after birth, or is accompanied by significant issues like severe back/pelvic pain or an umbilical hernia, surgical evaluation may be considered. In that case, the separated muscles are typically brought back together with sutures during a tummy tuck procedure.
Which Movements Should Be Avoided During This Period?
It's important to avoid movements that suddenly raise abdominal pressure and can worsen the separation: classic sit-ups/crunches, straight leg raises, heavy plank or push-up variations done without deep core support, heavy lifting and straining, and hard trunk rotations or backward bends. Instead, the focus should be on activating the deep core muscle (transversus abdominis), breath coordination, and pelvic floor exercises.
Results of any surgical or interventional procedure can vary from person to person. It's recommended to get detailed advice from your physician before any procedure.
Frequently Asked Questions
Does diastasis recti only affect how the belly looks?
No. Beyond appearance, it can also reduce back/pelvic support and lead to postural problems and back pain.
When should I start exercising?
This depends on your delivery type (vaginal/C-section) and your recovery — it's recommended to check with your physician or a pelvic floor physiotherapist before starting.