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Spina bifida

Spina bifida is when a baby's spine and spinal cord does not develop properly in the womb, causing a gap in the spine.

Spina bifida is a type of neural tube defect. The neural tube is the structure that eventually develops into the baby's brain and spinal cord.

The neural tube starts to form in early pregnancy and closes about 4 weeks after conception.

In spina bifida, part of the neural tube does not develop or close properly, leading to defects in the spinal cord and bones of the spine (vertebrae).

It's not known what causes spina bifida, but a lack of folic acid before and in the early stages of pregnancy is a significant risk factor.

Types of spina bifida

There are several different types of spina bifida, including:

  • myelomeningocele – the most severe type of spina bifida; the baby's spinal canal remains open along several vertebrae in the back, allowing the spinal cord and protective membranes around it to push out and form a sac in the baby's back
  • meningocele – another serious type of spina bifida where the protective membranes around the spinal cord (meninges) push out through the spine; the spinal cord usually develops normally so surgery can often be used to remove the membranes without damaging the nerves
  • spina bifida occulta – the most common and mildest type of spina bifida; 1 or more vertebrae does not form properly, but the gap in the spine is very small; spina bifida occulta does not usually cause any problems and most people are unaware they have it

These pages focus on myelomeningocele, the most severe type of spina bifida, and this is the type usually referred to whenever the term spina bifida is used.

Shine is a charity that provides help and support for people affected by spina bifida. 

Their website has more information about the other types of spina bifida.

Symptoms of spina bifida

Most people with spina bifida are able to have surgery to close the opening in the spine.

But the nervous system will usually already have been damaged, which can lead to problems such as:

Many babies will have or develop hydrocephalus (a build-up of fluid on the brain), which can further damage the brain.

Most people with spina bifida have normal intelligence, but some have learning difficulties.

Read more about the symptoms of spina bifida.

Causes of spina bifida

The cause of spina bifida is unknown, but a number of factors can increase the risk of a baby developing the condition.

These include: 

  • low folic acid intake during pregnancy
  • having a family history of spina bifida
  • medicines – taking certain medicines such as valproic acid (used to prevent seizures) during pregnancy has been linked to an increased risk of having a baby with spina bifida

Read more about the causes of spina bifida.

Diagnosing spina bifida

Spina bifida is often detected during the mid-pregnancy anomaly scan, which is offered to all pregnant women between 18 and 21 weeks of pregnancy.

If tests confirm that your baby has spina bifida, the implications will be discussed with you.

This will include a discussion about the possible problems associated with the condition, the treatment and support your child may need if you decide to continue with the pregnancy, and what your options are regarding ending the pregnancy, if that's your choice.

Tests after birth

Once the baby is born, a number of tests may be carried out to find out how bad the condition is and help decide which treatments are likely to be the best option.

Tests may include:

  • monitoring your child's head growth and carrying out a brain scan, using an ultrasound scanCT scan or MRI scan, to check for hydrocephalus (excess fluid on the brain)
  • ultrasound scans of the bladder and kidneys to check whether your baby stores their pee normally
  • an assessment of your baby's movements to check for paralysis

Surgery to repair the spine will usually be recommended soon after your baby is born.

Treating spina bifida

Treatments for the symptoms or conditions associated with spina bifida include:

  • surgery soon after birth to close the opening in the spine and treat hydrocephalus
  • therapies to help make day-to-day life easier and improve independence, such as physiotherapy and occupational therapy
  • assistive devices and mobility equipment, such as a wheelchair, or walking aids
  • treatments for bowel and urinary problems

With the right treatment and support, many children with spina bifida survive well into adulthood.

It can be a challenging condition to live with, but many adults with spina bifida are able to lead independent and fulfilling lives.

Read more about treating spina bifida.

Preventing spina bifida with folic acid

The best way to prevent spina bifida is to take folic acid supplements before and during pregnancy.

Folic acid recommendations

You should take a 400 microgram folic acid tablet every day while you're trying to get pregnant and until you're 12 weeks pregnant.

If you did not take folic acid before you conceived, you should start as soon as you find out you're pregnant.

Folic acid tablets are available from pharmacies and supermarkets, or a GP may be able to prescribe them for you.

You should also try to eat foods that contain folate (the natural form of folic acid), such as broccoli, spinach and chickpeas.

Read more about folic acid, including folic acid supplements and foods containing folate.

Recommendations for women at higher risk of spina bifida

Women thought to be at higher risk of having a child with spina bifida need to be prescribed a higher (5 milligram) dose of folic acid by a GP.

Women at higher risk include those:

  • with a family history of neural tube defects
  • with a partner with a family history of neural tube defects
  • who have had a previous pregnancy affected by a neural tube defect
  • with diabetes

A GP can advise you further about this.

If you're taking medicine to treat epilepsy, you should ask your GP for advice. You may also need to take a higher dose of folic acid.

Help and support

If you have a child with spina bifida or you've been diagnosed with the condition yourself, you may find it helpful to speak to other people affected by it.

Shine, the spina bifida and hydrocephalus charity, can provide you with details about local support groups and organisations.

You can find and contact your regional Shine team or read about support for carers on the Shine website.

National Congenital Anomaly and Rare Disease Registration Service

If you or your child has spina bifida, your clinical team will pass information about you or your child on to the National Congenital Anomaly and Rare Disease Registration Service (NCARDRS).

The NCARDRS helps scientists look for better ways to prevent and treat this condition. You can opt out of the register at any time.

Last Reviewed
14 April 2023
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