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Benign neonatal convulsions

What is a syndrome?

A syndrome is a group of signs and symptoms that, added together, suggest a particular medical condition. In epilepsy, examples of these signs and symptoms would be things like the age at which seizures begin, the type of seizures, whether the child is male or female and whether they have physical or learning disabilities, or both. The results of an electroencephalogram (EEG) are also used to help identify epilepsy syndromes.

Epilepsy Action has more information about seizure types, learning disabilities, and the EEG.

If you would like to know more about an epilepsy syndrome, please speak to your doctor. If you would like to know more about epilepsy in general, please contact Epilepsy Action.

Benign neonatal convulsions (BNC)

BNC is a relatively uncommon type of epilepsy that happens in babies and very young infants. The seizures, or convulsions, start in the neonatal period – between birth and 28 days after the baby has been born. Most seizures occur between three and 14 days after the baby has been born. Because many start on the fifth day of life, they used to be called ‘fifth day fits’. The seizures affect girls and boys equally.

There are two types of BNC:
• Benign familial neonatal convulsions
• Benign non-familial (also called sporadic) neonatal convulsions

In the first type, benign familial neonatal convulsions, someone else in the family must have had similar convulsions and this is usually one of the baby’s parents. It may be hard for the parents to know whether they had convulsions as a baby, because they won’t remember themselves! Therefore, if possible, the baby’s grandparents should be asked if they can remember whether the baby’s parents had convulsions or ‘fits’ at the same age. A genetic fault that causes benign familial neonatal convulsions has been found in some genes, which are part of chromosome number 8 and also chromosome number 20.

In the second type, benign non-familial (also called ‘sporadic’) neonatal convulsions, there is no history of convulsions at a similar age in other members of the family.


The seizures can appear in different forms:

  • The head turns to one side and then jerks a few times. This can be followed by a clonic seizure affecting either the right or left side of the body
  • The arms or legs stiffen and then jerk rhythmically for some seconds or up to a minute (called a clonic seizure)
  • There may be brief periods of apnoea – when the baby may stop breathing. The baby’s face may also go red and jerk and the eyes may water
  • There are repeated ‘cycling’ or ‘punching' movements of the legs or arms
  • Rarely, the whole body goes stiff and then all four limbs jerk (called a ‘tonic-clonic’ seizure). This type of seizure usually only occurs towards the end of the first month of life

Most seizures last less than two minutes. The seizures are more likely to happen when the baby or infant is sleepy or has just woken from sleep. The babies are otherwise normal and will have been feeding and behaving normally before the seizures started. Their birth will usually have been normal.


BNC is diagnosed when the doctor takes a careful history of when the seizures started and also a careful family history. Seizures that start on the fifth to fourteenth day after birth in otherwise normal babies are important clues as to the correct diagnosis. Results of tests such as blood tests and brains scans such as computed tomography (CT) or magnetic resonance imaging (MRI) are usually normal. The EEG may be normal or show only minor abnormalities.

There are many other causes for seizures, and other epilepsy syndromes that might also start at the same age. Causes can include low levels of glucose, calcium or magnesium in the blood, serious infections such as meningitis or encephalitis or abnormalities in the brain. Because of this, it is often important for the doctor to rule out these other causes first. This may include a lumbar puncture test to look for meningitis or encephalitis, and a more detailed brain scan, the MRI scan. There are also other epilepsy syndromes that can start in the neonatal period; these are much more severe syndromes and include:

Blood tests can also be done to look for the genetic fault called a ‘mutation’. This mutation is found in children with benign familial neonatal convulsions. This is called a mutation in the KCNQ2 and KCNQ3 genes. No genetic fault has yet been found in benign non-familial (also called sporadic) neonatal convulsions.

Epilepsy Action has more information about diagnosis.


Treatment is not always necessary because the seizures may only happen for a few weeks. However, sometimes epilepsy medicine is prescribed, particularly if the seizures continue to happen. Commonly used epilepsy medicines include carbamazepine (Tegretol), sodium valproate (Epilim) or much less commonly, phenobarbital or phenytoin. The newer drugs such as levetiracetam (Keppra) or lamotrigine (Lamictal) may also be effective. The medicine is usually given for six or occasionally 12 months and then slowly discontinued.

Epilepsy Action has more information of the treatment of epilepsy.


In most babies or infants, the seizures usually stop after a few days or weeks. More rarely, the seizures may continue for a few months. About one in 12 children who have benign familial neonatal convulsions may start having other types of seizures in late childhood or, more commonly, in adulthood. However, the risk seems to be much lower in benign non-familial (also called sporadic) neonatal convulsions. In this group, only one or two children in every 100 will develop epilepsy in adulthood. If this happens, the seizures are usually controlled with epilepsy medicines.

Babies feed normally, behave normally and develop normally. They usually don’t have learning disabilities or need extra care/support in the future.


Babies who have benign familial neonatal convulsions or benign non-familial (sporadic) neonatal convulsions can be given the full range of immunisations, including mumps, measles and rubella.


Contact a Family
Freephone helpline (UK only): 0808 808 3555
Website: cafamily.org.uk
Email: info@cafamily.org.uk 


Epilepsy Action would like to thank Drs Richard Appleton and Rachel Kneen (at Alder Hey Children’s Hospital, Liverpool) and Stewart Macleod (at Yorkhill Children’s Hospital, Glasgow), consultants who specialise in children’s epilepsy, who have updated this fact sheet.


This information is exempt under the terms of The Information Standard.

  • Updated September 2015
    To be reviewed September 2018

Comments: read the 6 comments or add yours


This is wonderful information. I had these seizures as an infant passed down from my grandma's father and on. My daughter had them recently as an infant and was on phenobarbital until she was 8 months old. The doctors who helped us had a hard time finding resources on this rare genetic condition, so thank you for helping me find a helpful resource for the doctors we've been working with. The information seems accurate with what we experienced and seen in the 5 generations of us who started having seizures at 5 days old. Thank you!

Submitted by Amy Butler on

Hello Amy

Thanks for your comment. It’s great to know our materials help.

We also have some information about epilepsy and inheritance which may interest you.



Advice & Information Team

Submitted by Sacha-Epilepsy ... on

Very informative and helpfull article. My niece who is now 5 months old has been suffering from seizures since she was one month old. Sometimes it is just stiffening of both arms and sometimes it goes more severe from jerking of both legs and arms with her face going red. As mentioned in your another article it may be subtle seizures. We have been giving her phenobarbital and Keppra. I want to know that does this Benign epilepsy fades away with time and age?
Looking forward for response.

Submitted by asim on

Hello Asim

It is good to hear that you found our information useful and that you are looking to learn more so you can support your niece.

For most babies, the seizures will stop after a few days, weeks, or rarely, months.

If a child experiences benign familial neonatal convulsions, approximately one child in 10 have may have other types of seizures in late childhood, or in adulthood.

If a child has benign non-familial convulsions, approximately one or two in every 100 children will develop epilepsy as an adult. If this happens, seizures are usually controlled with epilepsy medicines.

If your family would like more information about her long-term risk of more seizures, it would be worth her parent’s talking to her epilepsy specialist.

Epilepsy Action Advice & Information Team

Submitted by Karen, Epilepsy... on

Hello, I want to thank you for this information! Myself, and my two sons were diagnosed with this genetic mutation. I have had seizures sporadically in my teen and possibly my adult years as well. I was wondering if there is any way of getting more awareness of this condition since it is so rare.

Submitted by Lorien Ferguson on

Hi Lorien
Thank you for your comment.

There are many different types of epilepsy and epilepsy syndromes. We try to raise awareness of the different types as much as possible and if we receive any new information we write about it.  We mainly do this via our magazine Epilepsy Today , our website or social media.

Diane Wallace
Epilepsy Action Advice and Information Team

Submitted by Diane, Epilepsy... on