What is an abdominal diastasis? And is it normal?

During pregnancy, as your baby grows, your abdominal muscles and fascia must stretch to allow more room. The main muscle we are talking about is the Rectus Abdominus AKA ‘the six pack’ and the fascia, the Linea Alba. The Linea Alba connects the two halves of the Rectus Abdominus together. During pregnancy the hormone Relaxin is released, this causes the Linea Alba to become softer and more likely to stretch. This stretching can cause the two halves of the Rectus Abdominus to separate. This is totally normal and up to 90% of women at 36 weeks will have a degree of diastasis.

What causes the stomach muscles to separate during pregnancy?

When you use your tummy muscles, such as getting out of bed or the bath, the Rectus Abdominus will tighten, pulling the Linea Alba sideways. If the Linea Alba is stretchy or was already stretched before pregnancy you will see a bulge/dome or peak coming out of your tummy. The bulge is created as the increase in intra-abdominal pressure during these activities causes your organs to push outwards. As the Linea Alba stretches, it becomes even softer. The more it stretches apart, the less tension you have over your stomach. This will have an implication for getting your tummy back after delivery.

10 tips on how to look after your tummy muscles while pregnant

1) Posture

Posture is usually the main area of focus, it can make a big difference with only a little effort. The problem is that a lot of pregnant women tend to adopt a sway posture, this promotes the muscles and fascia on the front to become long. When the muscles on your front become long it can cause them to lose tension when you return to a normal posture after pregnancy. You can help improve your post-natal recovery by correcting your posture during pregnancy.

  • Firstly, make sure you soften your knees, don’t lock them straight.
  • Gently tuck your tail bone underneath you, practice this against a wall.
  • Bring your ribs down and forward.

The aim is to remember to correct your posture throughout the day, even if it means taking small breaks at work to practice.

2) Rolling into bed

As soon as you find out you are pregnant you should get into the habit of rolling in and out of bed. This will help you to avoid doing a daily sit up and reverse sit up which will cause more stretching in the muscles and fascia.

3) Avoid sit ups / plank type abdominal exercises  

This will cause you to have long strong front muscles and potentially stretch the Linea Alba further, making post-natal recovery harder. Planks are just as intense as crunches; however, we do want you to work the deep core…

Read next: Which Exercises Are Safe During Pregnancy?

4) It’s ok to work the deep core

To help reduce the pressure on your Linea Alba and Rectus Abdominus muscles, it’s important to work your inner tummy muscles aka the transverse abdominus. This helps to create lift and avoid stretching of the outer muscles.

To contract this muscle, gently pull your belly button in towards your spine or try to gently lift your bump. Try to hold this while doing other general exercises I.e., lifting, rolling in bed and when you go to stand up.

If you are doing this exercise correctly your tummy should shrink a little in size. If you are pulling too hard with your outer abdominals your tummy might go into a more pronounced point.

5) Lifting

Any heavy lifting that you have to really think about should ideally be avoided. However, if you have toddlers then this is not always possible. When lifting make sure you really correct your posture and contract the deep tummy muscle as per tip number 4.

6) Coughs and colds

Illness is always a problem this time of year. The power of coughs can really put pressure on those stretched tummy muscles. When coughing, try to sit down and make sure you squeeze your pelvic floor muscles. This can help reduce tension on the tummy muscles.

7) Morning sickness

Being continuously sick, like coughing, can cause pressure on your tummy muscles. Whilst unavoidable in most cases, it can be helped sometimes by making sure you are eating little and often. As difficult as it sounds you should attempt to squeeze your pelvic floor muscle during any bouts of sickness.

Read next:The Low-Down on Anti-Sickness Pills & How to Alleviate Morning Sickness

8) Posture … did I mention this already?

9) Playing with toddlers

Just being mindful of how you get on and off the floor when playing can make all the difference. Try not to make any quick, unconsidered movements whilst playing. Make sure you roll on to your side when getting up from the floor.

10) See a physio for a post-natal check-up at 6 weeks

See a physiotherapist at six weeks so that they can check your abdominal muscles early on and advise what exercises to do and check your progress.

If after reading these top tips you are still concerned or you are not sure on the exercises you are doing, try and see a specialist women’s health physiotherapist.

Written by Jenny Constable. If you have any questions then please email Jenny at jennyconstable@sixphysio.com

Specialist women’s and men’s health physiotherapist at SIXPhysio

Other articles from Jenny Constable:

How To Reduce The Risk Of Tearing During Labour

How To Reduce Your Risk Of Pelvic Organ Prolapse

About The Author

Jenny Constable
Specialist Physiotherapist

Since qualifying from the University of Hertfordshire in 2007, Jenny has had a wealth of experience treating a wide variety of musculoskeletal, Women's Health and Men's Health conditions. After Qualifying Jenny worked at The Imperial College Healthcare Trust in London for 6 years. This meant working across a variety of settings with some of the leading experts in physiotherapy. It was while working at St Mary's Hospital that her passion for Women's health started. She then spent the next 3 years working at Queen Charlottes and Chelsea Hospital specialising in Women's Health. Women's Health Physiotherapy focuses on ante natal, post natal musculoskeletal conditions and pelvic floor muscle dysfunctions such as prolapse and urinary incontinence. Jenny joined SIX in 2014 where she built up our women's health service at our Harley street clinic. We have now moved to our brand new clinic in Fitzrovia and she is working to build on our women's and now men's health service there. Jenny is passionate to help men and women with conditions that impact their quality of life such as incontinence, pelvic pain and sexual dysfunction. She loves to see their lives change after education, exercise and manual treatments. Jenny has undertaken many postgraduate courses to help further her skills and enable her to choose the best possible treatment for her patients. Some of the courses she has a special interest in are; Pilates, acupuncture and advanced manual therapy for pelvic floor muscle dysfunctions. When not at SIX physio Jenny is kept busy by her 4 year old daughter Abigail and Maddie her 9 month old, oh and don't forget the 3 ponies pixie, Frankie and Mayfair.

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