Giving birth is an incredible physical accomplishment—but it can also leave your body feeling unfamiliar, unstable, and weaker than before. One of the most common complaints among new mothers is back weakness or pain, even months after delivery.
If you’re wondering, “Why does my back feel so weak after giving birth?”, you’re not alone. Postpartum back weakness has several causes—including hormonal changes, muscle imbalances, posture shifts, and a common condition called diastasis recti abdominis (DRA). The good news: with the right exercises and awareness, you can rebuild strength safely and effectively.
Why Your Back Feels Weak After Giving Birth
1. Diastasis Recti Abdominis (DRA)
DRA is the natural separation of the abdominal muscles that occurs during pregnancy to make space for the growing baby. After birth, these muscles often remain stretched or weakened, which means:
- They can’t properly support your spine.
- Your posture changes, increasing strain on the lower back.
- Everyday tasks like lifting your baby become harder.
When the core is weak, the back compensates—leading to fatigue, instability, and pain.
2. Hormonal Changes
Pregnancy hormones like relaxin loosen ligaments to prepare the pelvis for childbirth. These lax ligaments remain loose for months postpartum, reducing stability in the spine and pelvis.
This instability can make your back feel weak or achy, especially during lifting or bending.
3. Posture Changes During Pregnancy & Postpartum
Nine months of a forward-shifted center of gravity encourages:
- An arched lower back
- Forward-tilted pelvis
- Weaker glutes
- Overworked back muscles
After birth, hours spent feeding, rocking, and carrying a newborn add new posture stressors.
4. Weak Pelvic Floor Muscles
Your pelvic floor works together with your deep core to support your spine. Pregnancy and childbirth can weaken these muscles, leading to imbalances that place more load on your back.
5. Fatigue & Lack of Core Activation
Sleep deprivation, physical exhaustion, and decreased activity mean your core and back muscles are simply not being used the way they were pre-baby.
10 Safe Exercises to Strengthen Your Back After Giving Birth
Important: If you have significant diastasis recti, pelvic pain, or are newly postpartum, consult a pelvic floor physical therapist for personalized guidance.
These exercises focus on rebuilding stability, improving posture, and gradually strengthening your back.
1. Diaphragmatic Breathing (Deep Core Reset)
Why: Helps reconnect core and pelvic floor and supports spine stability.
How:
- Lie on your back or sit comfortably.
- Inhale through your nose, letting your belly expand.
- Exhale slowly, gently lifting your pelvic floor and drawing your lower belly in.
2. Pelvic Tilts
Why: Activates deep core muscles and mobilizes the lower back.
How:
- Lie on your back with knees bent.
- Flatten your lower back into the floor, then gently arch it.
- Move slowly, focusing on control.
3. Heel Slides
Why: Great for early core activation without straining DRA.
How:
- From the pelvic tilt position, slide one heel away, then return.
- Keep your core gently engaged and hips stable.
4. Cat–Cow Stretch
Why: Improves spinal mobility and relieves stiffness.
How:
- On hands and knees, alternate between arching and rounding your back while breathing deeply.
5. Bird-Dog
Why: Builds stability in the core and back without compressing the spine.
How:
- From all fours, extend opposite arm and leg.
- Keep hips level and core steady.
6. Glute Bridges
Why: Strengthening glutes reduces strain on the lower back.
How:
- Lie on your back with knees bent.
- Lift hips while squeezing glutes.
- Lower slowly with control.
7. Modified Side Plank
Why: Helps strengthen obliques and deepen core muscles without stressing DRA.
How:
- Lie on your side, knees bent.
- Lift your hips, keeping spine long.
8. Wall Angels
Why: Strengthens upper-back muscles and improves posture weakened by feeding/carrying baby.
How:
- Stand with back against a wall.
- Move arms up and down like making a snow angel while keeping ribs down.
9. Seated Rows (Resistance Band)
Why: Strengthens middle back, reducing slumping and shoulder rounding.
How:
- Sit with legs extended.
- Loop band around feet and pull back, squeezing shoulder blades.
10. Hip Hinge (Bodyweight)
Why: Re-trains spine-safe movement and builds lower-back endurance.
How:
- Stand with soft knees.
- Hinge forward from the hips while keeping a straight spine.
- Return to standing by engaging glutes.
Postpartum back weakness is incredibly common—and it’s usually a sign that your body needs time, gentle strengthening, and balanced movement to recover.
By restoring your deep core, supporting your pelvic floor, and gradually strengthening your back muscles, you can regain stability, reduce pain, and feel strong again.
Looking to optimize your well being with pelvic floor physical therapy? Reach out to us at Pelvic Health Center in Madison, NJ to set up an evaluation and treatment! Feel free to call us at 908-443-9880 or email us at [email protected]