Diastasis recti does tend to get worse with each pregnancy. The more times your abdominal wall stretches to accommodate a growing baby, the less fully the connective tissue between your ab muscles recovers, and the wider the gap can become. In one study, diastasis recti was found in just 2% of first-time mothers but 59% of women who had given birth multiple times. Women with three or more deliveries face roughly 2.7 times the risk compared to those with only one.
Why Each Pregnancy Compounds the Problem
The strip of connective tissue running down the center of your abdomen, called the linea alba, is what holds your left and right ab muscles together. During pregnancy, two things happen simultaneously: hormones make that tissue softer and stretchier, and the expanding uterus pushes outward against it for months. This combination is what causes the muscles to separate.
After delivery, the gap narrows on its own as hormone levels normalize and the tissue firms up again. But recovery is often incomplete. Ultrasound measurements of 171 pregnant women showed that by six weeks postpartum, the gap between the muscles had decreased from its late-pregnancy peak but was still wider than it had been at 12 weeks of pregnancy. The muscles themselves were thinner and less stiff than before, and they hadn’t fully bounced back either.
This means the next pregnancy doesn’t start from the same baseline. The tissue is already a bit wider and a bit weaker, so the same hormonal softening and mechanical stretching pushes it further apart. Each cycle of stretching and incomplete recovery leaves the connective tissue progressively less resilient.
How Parity Affects Severity
The numbers tell a clear story. A large retrospective study of postpartum women in southwest China found that among women with three or more deliveries, 73.7% had a separation of 3 centimeters or greater. For reference, a gap wider than about 2.2 centimeters is the commonly used threshold for diagnosing diastasis recti. So the majority of women with high parity aren’t just developing a mild separation; they’re developing a moderate to severe one.
Parity doesn’t act alone, though. The same study found that higher BMI, greater gestational weight gain, and higher birth weight all independently increased severity. Age plays a role too: women in their 30s and 40s had more moderate-to-severe separations than women in their 20s. These factors layer on top of each other. A 38-year-old on her fourth pregnancy who gains significant weight is at substantially higher risk than a 28-year-old in the same situation.
Other Factors That Raise Risk
Beyond the number of pregnancies, the characteristics of each pregnancy matter. A larger baby puts more outward force on the abdominal wall. In some cases, the baby’s position concentrates that force unevenly. When the baby sits more toward the front, the strain focuses directly on the midline connective tissue rather than spreading across the whole abdominal wall, which can make the separation worse.
Twin and triplet pregnancies have been proposed as a risk factor because of the greater abdominal expansion involved, though study results on this are mixed. One study found twin pregnancy increased risk, while another did not. What’s more consistent in the research is the role of total abdominal stretching over a woman’s lifetime, meaning the cumulative effect of all pregnancies, not just one large one.
What About Pelvic Floor Problems
Many women worry that worsening diastasis recti will lead to pelvic floor issues like incontinence or organ prolapse. The research here is more reassuring than you might expect. A study comparing women with and without diastasis recti found no significant difference in rates of urinary incontinence (about 20% in both groups) or pelvic organ prolapse (about 8% in both groups). Even when researchers looked specifically at women with increasingly severe separations, at 3, 4, and 5 centimeters, the rates of pelvic floor dysfunction didn’t climb. The width of the gap alone doesn’t appear to predict these problems.
That said, diastasis recti can still cause real functional issues. A weakened midline means your core can’t transfer force as effectively, which can show up as lower back pain, difficulty with lifting, a visible bulge when you engage your abs, or a feeling of abdominal weakness that makes everyday tasks harder.
Can You Reduce the Impact Before the Next Pregnancy
The window between pregnancies is your best opportunity to recover as much tissue integrity as possible. While there’s limited research on whether specific exercises between pregnancies prevent worsening in the next one, the logic is straightforward: starting from a narrower, stronger baseline gives your abdominal wall more room before it reaches the point of significant separation.
Postpartum core rehabilitation typically focuses on deep abdominal muscles that act like a corset around your midsection. Exercises that gently draw the belly inward, rather than pushing it outward (like crunches do), are generally recommended. A physical therapist who specializes in postpartum recovery can assess your specific gap and design a program around it. The goal isn’t just to close the gap but to restore tension and stiffness in the connective tissue so it can better handle the demands of another pregnancy.
Managing the factors you can control during pregnancy also helps. Staying within recommended weight gain ranges, avoiding heavy lifting that forces your abs to dome outward, and continuing appropriate core engagement throughout pregnancy can all reduce the mechanical load on the linea alba.
When the Separation Won’t Close on Its Own
Some degree of spontaneous recovery happens in the early months postpartum as pregnancy hormones clear your system. But for women with persistent, wide separations after multiple pregnancies, especially those exceeding 3 to 4 centimeters, exercise alone may not be enough. Surgical repair, often performed as part of an abdominoplasty, can physically bring the muscles back together and reinforce the midline tissue. This is typically considered after a woman has finished having children, since a subsequent pregnancy would stretch the repair.
The decision to pursue surgical repair usually comes down to functional impairment rather than a specific measurement. If the separation is limiting your daily activities, causing persistent back pain, or creating a hernia, those are the situations where repair offers the most benefit.