Postpartum Core Weakness: Signs, Causes, and Physio Support

Pregnancy and birth place a significant load on your body. Even after your baby arrives, your abdominal muscles, pelvic floor, posture, breathing pattern, and back support system may still be recovering.

For many women, postpartum core weakness does not feel like simple “weak abs.” It may show up as lower back pain, a heavy or unstable feeling through the trunk, difficulty lifting your baby, doming through the abdomen, or feeling unsure about returning to exercise.

The good news is that postnatal recovery can be guided safely. With the right assessment, hands-on support, core rehab, and Pilates-based strengthening, you can rebuild confidence in your body and reduce the strain of everyday activities.

What Is Postpartum Core Weakness?

Postpartum core weakness refers to reduced strength, control, coordination, or support through the muscles that help stabilise your trunk after pregnancy and birth.

Your core is not just your “six-pack” muscles. It includes:

• Deep abdominal muscles
• Pelvic floor muscles
• Diaphragm and breathing system
• Lower back muscles
• Hip and glute muscles
• Postural support muscles around the spine and pelvis

During pregnancy, the abdominal wall stretches to make room for your growing baby. Your posture changes, your rib cage and pelvis adjust, and the muscles that usually support your spine may not work in the same coordinated way.

After birth, your core may need time and guided retraining to regain strength and control. This is especially true if you are feeding for long periods, lifting and carrying your baby often, recovering from a caesarean birth, managing pelvic floor symptoms, or trying to return to exercise before your body is ready.

Postpartum core weakness is common, but it should not be ignored if it is affecting your comfort, movement, or daily life.

Common Signs Your Core Has Not Fully Recovered After Pregnancy

Postpartum core weakness can feel different from person to person. Some women notice obvious abdominal weakness, while others mainly feel back pain, poor posture, or reduced confidence with movement.

Common signs include:

• Lower back pain after feeding, lifting, carrying, or standing
• Feeling unstable through your middle
• Difficulty getting out of bed or off the floor
• A bulge, ridge, or doming through the abdomen when sitting up or lifting
• Poor posture, especially rounded shoulders and an arched lower back
• Feeling weak when carrying your baby capsule or pram
• Struggling to return to gym, running, Pilates, or sport
• Pelvic heaviness, leaking, or pressure symptoms
• Neck, shoulder, or upper back tension from feeding posture
• Feeling like your body “cannot switch on” during exercise

One practical example is getting out of bed. If you sit straight up from lying down and notice your tummy doming or your lower back straining, your core may not be managing pressure well yet.

Another example is lifting your baby from the cot. If you hold your breath, brace hard, or feel a pull through your abdomen or lower back, your body may need help relearning how to coordinate breathing, abdominal support, and pelvic control.

These signs do not mean you have done anything wrong. They simply suggest your body may benefit from a proper postnatal physio assessment and a structured recovery plan.

Why Core Weakness Can Contribute to Postnatal Back Pain

Your core helps support your spine during everyday movements. When this support system is not working efficiently, your back muscles may have to work harder than usual.

This is one reason postpartum core weakness can contribute to postnatal back pain.

After birth, your daily routine often involves repeated bending, lifting, twisting, feeding, and carrying. These tasks may seem small, but they happen many times a day.

Common examples include:

• Bending over the cot
• Lifting your baby from the floor
• Carrying a baby capsule
• Feeding in a rounded posture
• Pushing a pram uphill
• Standing with one hip shifted while holding your baby
• Sitting for long periods during contact naps or feeds
• Reaching awkwardly into the car seat

If your deep core, pelvic floor, hips, and back muscles are not sharing the load well, your lower back can become overloaded. You may notice aching by the end of the day, pain when standing up from sitting, or stiffness after feeding.

At Get Better Physiotherapy and Pilates Centre, the focus is not just on treating the sore spot. The goal is to find the root cause of your pain, relieve symptoms, and help you build the strength needed for long-term recovery.

What Causes Core Weakness After Birth?

Postpartum core weakness can develop for several reasons. Often, it is not caused by one single issue, but by a combination of pregnancy changes, birth recovery, posture, and daily demands.

Common causes include:

Pregnancy-related stretching
As your baby grows, the abdominal wall stretches. This can temporarily reduce abdominal strength, tension, and coordination.

Hormonal changes
Pregnancy hormones affect ligaments and connective tissue. This can influence joint support and how stable your pelvis and spine feel after birth.

Delivery recovery
Both vaginal birth and caesarean birth require recovery. A caesarean involves healing through abdominal layers, while vaginal birth can place significant load on the pelvic floor and surrounding tissues.

Reduced activity during recovery
In the early weeks, rest is important. However, reduced activity can also lead to deconditioning, especially if pain, fatigue, or fear of movement prevents gradual strengthening.

Feeding posture
Long periods of feeding can place strain through the neck, shoulders, upper back, and lower back, especially if you are sitting without support.

Baby care demands
New mums lift, bend, carry, rock, feed, and settle their babies many times each day. These repetitive movements can aggravate weakness or pain if your body is not yet ready for the load.

Returning to exercise too quickly
Exercises such as sit-ups, crunches, heavy lifting, intense planks, running, or high-impact workouts may be too much if your core and pelvic floor are not ready.

A postnatal physio can help identify which factors are most relevant to you, rather than giving you a generic exercise list.

Postpartum Core Weakness vs Diastasis Recti: What Is the Difference?

Postpartum core weakness and diastasis recti are related, but they are not the same thing.

Postpartum core weakness refers to reduced strength, control, coordination, or endurance through the muscles that support your trunk, pelvis, breathing, and spine.

Diastasis recti refers to separation or widening between the left and right sides of the rectus abdominis muscles along the midline of the abdomen. This happens when the connective tissue between the abdominal muscles stretches during pregnancy.

You can have postpartum core weakness without significant diastasis recti. You can also have diastasis recti without severe pain. What matters is not only the width of the gap, but also how well your abdominal wall creates tension, controls pressure, and supports movement.

Signs often associated with diastasis recti include:

• Doming or coning through the midline of the abdomen
• A soft or sunken feeling along the midline
• Difficulty creating abdominal tension
• Lower back discomfort
• A feeling of reduced trunk support

Many women become worried when they notice abdominal separation. However, recovery is not just about “closing the gap.” A good rehab plan focuses on breathing, pressure control, deep core activation, posture, pelvic floor function, and gradual strengthening.

This is where an assessment can be very helpful. It allows your physio to check how your abdominal wall behaves during real movements such as lifting, rolling, standing, and exercise.

Daily Movements That Can Make Core Weakness Feel Worse

Postpartum core weakness often becomes more noticeable during everyday activities. These movements are not necessarily “bad,” but they may need to be modified while your body rebuilds strength.

Daily movements that may worsen symptoms include:

Getting out of bed by sitting straight up
This can increase pressure through the abdominal wall and may cause doming. Try rolling onto your side first, then using your arms to push yourself up.

Lifting your baby while holding your breath
Breath-holding can increase pressure through the abdomen and pelvic floor. Exhale gently as you lift and keep the baby close to your body.

Bending over the cot repeatedly
This can strain the lower back. Bend your knees, bring your baby close, and avoid twisting while lifting.

Pushing the pram with poor posture
If the handle is too low or you are leaning forward, your back and shoulders may overwork. Keep your ribs stacked over your pelvis and relax your shoulders.

Feeding without support
Use pillows to bring your baby closer to you, rather than rounding your body down toward your baby.

Returning to intense exercise too quickly
High-impact workouts, heavy weights, sit-ups, or advanced abdominal exercises may worsen doming, pressure, leaking, or back pain if your core is not ready.

Carrying everything on one side
Carrying the baby, nappy bag, capsule, or groceries on one side can create uneven load through the back and pelvis. Alternate sides where possible.

Small changes can make a big difference. The aim is not to avoid movement, but to move in a way that supports healing and reduces overload.

How a Postnatal Physio Assessment Can Help Find the Root Cause

Every postpartum body is different. That is why a proper postnatal physio assessment is so important.

At Get Better Physiotherapy and Pilates Centre in Regents Park, the first step is to find the root cause of your pain, weakness, or movement difficulty. Rather than guessing, your physiotherapist will assess how your symptoms affect your daily life and how your body moves.

A postnatal physio assessment may look at:

• Your birth and recovery history
• Where you feel pain, weakness, pressure, or instability
• How your symptoms affect feeding, lifting, sleeping, walking, or exercise
• Posture and spinal movement
• Core activation and abdominal pressure control
• Breathing patterns
• Hip, pelvis, and lower back function
• Movement habits during lifting, bending, and getting up
• Diastasis recti signs, if relevant
• Pelvic floor symptoms, where appropriate

This assessment-first approach helps create a clearer plan. For example, two mums may both have lower back pain, but one may need help with feeding posture and upper back mobility, while another may need deep core rehab, glute strengthening, and lifting technique.

The right plan should feel specific to your body and your goals.

At Get Better Physiotherapy and Pilates Centre, treatment may include hands-on therapy for pain relief, education, specific do’s and don’ts, and a written plan of action to guide your short-term and long-term recovery.

Safe Core Rehab and Pilates Exercises After Pregnancy

Safe postnatal core rehab is not about rushing into intense abdominal workouts. It is about rebuilding strength from the inside out.

A good starting point often includes:

• Breathing control
• Gentle deep core activation
• Pelvic floor coordination
• Pelvic tilts
• Heel slides
• Supported bridges
• Gentle cat-cow movement
• Postural strengthening
• Glute and hip strengthening
• Modified Pilates exercises
• Gradual return to lifting and impact

Pilates can be a helpful part of postpartum core recovery because it focuses on control, breathing, posture, alignment, and progressive strengthening. However, postnatal Pilates should be modified to match your recovery stage.

Exercises may need to be adjusted if you notice:

• Abdominal doming or coning
• Pelvic heaviness
• Leaking
• Back pain
• Pain around a caesarean scar
• Increased pressure through the abdomen
• Symptoms that worsen after exercise

A safe core rehab plan should progress gradually. Early exercises may look simple, but they are designed to help your body reconnect with the deep support system before moving into harder movements.

At Get Better Physiotherapy and Pilates Centre, the goal is to help you get strong again with Pilates for back pain and core rehab, while also making sure the exercises suit your symptoms, stage of recovery, and daily demands.

When to Book Postnatal Physiotherapy in Regents Park

You do not need to wait until symptoms become severe before booking postnatal physiotherapy.

Consider booking a postnatal physio assessment in Regents Park if you have:

• Ongoing lower back pain after birth
• Abdominal doming or coning
• Difficulty lifting or carrying your baby
• Pain when feeding, bending, or standing
• A feeling of instability through your core or pelvis
• Trouble returning to exercise
• Pelvic heaviness, leaking, or pressure
• Pain around your caesarean scar
• Poor posture that is causing discomfort
• Uncertainty about which exercises are safe

You may also benefit from an assessment if you simply want guidance before returning to Pilates, gym training, running, sport, or heavier lifting.

At Get Better Physiotherapy and Pilates Centre, the process is designed to be clear and supportive:

1. Find the root cause with a full assessment.
2. Get pain relief with hands-on physiotherapy and manual therapy where appropriate.
3. Get strong with Pilates for back pain, core rehab, and a personalised plan.

Treatment takes place in private rooms, not curtained cubicles, which can be especially reassuring for postnatal clients who value comfort and privacy.

Conclusion

Postpartum core weakness is common after pregnancy and birth, but it should not be dismissed if it is affecting your back, posture, lifting, exercise, or confidence.

Your core is more than your abdominal muscles. It includes your breathing, pelvic floor, posture, hips, spine, and movement control. When these areas are not working well together, everyday tasks like feeding, carrying, bending, and lifting can place extra strain on your body.

A postnatal physio assessment can help identify the root cause of your symptoms and guide you through safe, progressive recovery.

If you are experiencing postpartum core weakness, postnatal back pain, abdominal doming, or difficulty returning to exercise, Get Better Physiotherapy and Pilates Centre in Regents Park can help you understand what is happening and create a clear plan to move forward.

Book a consult with Get Better Physiotherapy and Pilates Centre, or call 07 3800 3417 to speak with the friendly team and ask any questions about postnatal physiotherapy, core rehab, and Pilates support.