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How long do infantile spasms last?

Author

Mia Phillips

Updated on March 18, 2026

How long do infantile spasms last?

Infantile spasms are considered an age-specific epilepsy. They typically begin in an infant between 3 and 8 months of age. In most children, IS starts by 1 year of age and usually stop by 2 to 4 years of age.

Similarly, you may ask, do infantile spasms go away?

They look very much like a startle. Babies also might have slowed development or loss of skills (like babbling, sitting, or crawling). Although the spasms usually go away by the time a child is 4 years old, many babies with IS will have other kinds of epilepsy later in life.

Similarly, how often do babies have infantile spasms? Infantile spasms (also known as West syndrome) is a form of epilepsy that occurs in 1 in 2,000 children.

Thereof, do infantile spasms happen every day?

In between clusters of spasms many hours without spasms can occur. Occasionally more than a day will pass without a cluster of spasms. Clusters of spasms often occur after waking from sleep, whatever time of the day. When an infant has a typical spasm, there are several movements.

What happens if infantile spasms are left untreated?

Infantile spasms is a complex and rare disorder that can have very serious consequences. It can lead to death in some babies, and cause intellectual disabilities and developmental problems in others. Even once the seizures are gone, the damaging brain effects can remain.

What infantile spasms look like?

What are infantile spasms? Infantile spasms, sometimes called West syndrome, are a type of seizure that occurs in babies. The spasms look like a sudden stiffening of muscles, and the baby's arms, legs, or head may bend forward. The seizures occur in a series of short spasms, about one to two seconds in length.

How do I know if I have infantile spasms?

Symptoms of Infantile Spasms (IS)
  1. Raise their arms over their head or stick their arms straight out to the side.
  2. Stiffen their legs or "tuck them into the belly," as if having stomach pain.
  3. Suddenly bend at the waist.
  4. Drop or bob their heads briefly.
  5. Roll their eyes back suddenly with subtle head nodding.

Do infantile spasms hurt?

Each spasm usually lasts less than 10 seconds. A cluster or severe spasms can last for minutes. After a spasm, the baby may cry or laugh. The spasms do not cause pain, but the baby may cry because the quick jerking movement surprises them.

Do infantile spasms show up on EEG?

Infantile spasms are a very specific type of seizure with a characteristic age of onset (a typical age when seizures start). They are nearly always accompanied by a very characteristic pattern on the electroencephalogram (EEG). This pattern is called 'hypsarrhythmia'.

Are baby spasms normal?

Expect some of the following: Sudden jerks or twitches of the arms, hands or legs. If they only occur during sleep, they are most likely normal. How Long: last a few seconds, but can recur.

Do infantile spasms happen while sleeping?

The spasms are brief, often lasting one or two seconds. They tend to occur in clusters where the infant may have several spasms over a few minutes. Spasms often occur when the infant is falling asleep or waking up from sleep. They rarely occur during sleep.

Is infantile spasms genetic?

In addition to the genetic mutations in TSC1 and TSC2, which cause tuberous sclerosis, specific genetic defects have been identified in many patients with early onset of infantile spasms, including mutations in the gene ARX on the short arm of chromosome X, which is associated with a wide variety of structural brain

What does seizure look like in baby?

Focal seizures: Focal seizures may involve the infant having spasms or rigidity in one muscle group, becoming pale, sweating, vomiting, screaming, crying, gagging, smacking their lips, or becoming unconscious. For an example of how a focal seizure might look, click here.

Can infantile spasms go away on their own?

The sooner your little one starts treatment for infantile spasms or West syndrome, the better, because this condition can affect how their mind and body develop. In some cases, the seizures and spasms will stop on their own, but most children will need treatment.

Can colic cause spasms?

Infant colic is a painful condition thought to occur as a result of muscle spasms in a baby's tummy. The muscle spasms are more common in the late afternoon and evening compared to other times of day.

What causes newborn to jerk?

UI researchers believe that infants' twitches during rapid eye movement (REM) sleep are linked to sensorimotor development—that when the sleeping body twitches, it's activating circuits throughout the developing brain and teaching newborns about their limbs and what they can do with them.

How do you treat infantile spasms?

Treatment of infantile spasms has little class I data, but adrenocorticotropic hormone (ACTH), prednisolone and vigabatrin have the best evidence as first-line medications. Other therapies including the ketogenic diet and other anti-epileptics medications may also prove useful in the treatment of infantile spasms.

What are the signs to look for in neurological symptoms in infants?

Neonatal Neurological Disorder Symptoms
  • Fussiness.
  • Decreased level of consciousness.
  • Abnormal movements.
  • Feeding difficulty.
  • Changes in body temperature.
  • Rapid changes in head size and tense soft spot.
  • Changes in muscle tone (either high or low)

Why does my baby squirm all night?

While older children (and new parents) can snooze peacefully for hours, young babies squirm around and actually wake up a lot. That's because around half of their sleep time is spent in REM (rapid eye movement) mode — that light, active sleep during which babies move, dream and maybe wake with a whimper.

Can infantile spasms cause autism?

A new study found that nearly half of babies who suffer from infantile spasms are not accurately diagnosed for more than a month and this delay can increase the risk of intellectual disability, autism, lifelong epilepsy, and death.

Do infantile spasms cause mental retardation?

Infantile spasms (IS), i.e., West syndrome, as an epileptic encephalopathy, represents one of the major causes of acquired mental retardation in early childhood (Roger and Dulac, 1994).

Does West syndrome go away?

West syndrome (also called infantile spasms) should go away by the time your child is 4 years old. But most people who had it will get another kind of epilepsy or seizure condition in childhood or as an adult. About 1 in 5 will have Lennox-Gastaut syndrome, a severe form of epilepsy with multiple types of seizures.

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