Medical Conditions

Baby Seizure Without Fever

Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist

Content reviewed against published AAP, NIH, CDC guidelines

Editorial policy

Last reviewed:

If your baby has been diagnosed with or you suspect baby seizure without fever, here is what the evidence says.

The short answer

A seizure without fever in a baby is always a reason for medical evaluation. While febrile seizures (triggered by fever) are common and generally benign, seizures without fever can have various causes including low blood sugar, infections, brain injury, genetic conditions, or epilepsy syndromes like infantile spasms. Seizures in babies can look different from what you might expect - they may include staring spells, repetitive jerking of one limb, or brief full-body stiffening. Any suspected seizure should be evaluated by a pediatrician promptly.

Key takeaways

  • A seizure without fever in a baby is always a reason for medical evaluation. While febrile seizures (triggered by fever) are common and generally benign, seizures without fever can have various causes including low blood sugar, infections, brain injury, genetic conditions, or epilepsy syndromes like infantile spasms. Seizures in babies can look different from what you might expect - they may include staring spells, repetitive jerking of one limb, or brief full-body stiffening. Any suspected seizure should be evaluated by a pediatrician promptly.
  • Usually normal when: Your baby has brief jitteriness when startled or cold that stops when you gently hold the limb - this is a normal startle reflex, not a seizure
  • Call your doctor if: Your baby is having a seizure right now - place them on a safe surface on their side, do not put anything in their mouth, time the seizure, and call 911 if it lasts longer than 5 minutes or if this is the first seizure
  • Varies by age — see the age-by-age breakdown below
“Fever itself is not an illness — rather, it is a sign or symptom that the body is fighting an infection. Fever stimulates certain defenses, such as the white blood cells, which attack and destroy invading bacteria.”
— Fever and Your Child, American Academy of Pediatrics (AAP)

This is one of the most common questions parents ask. Searching for answers means you care.

What Parents Should Know

According to AAP, NIH, CDC guidelines, a seizure without fever in a baby is always a reason for medical evaluation. While febrile seizures (triggered by fever) are common and generally benign, seizures without fever can have various causes including low blood sugar, infections, brain injury, genetic conditions, or epilepsy syndromes like infantile spasms. Seizures in babies can look different from what you might expect - they may include staring spells, repetitive jerking of one limb, or brief full-body stiffening. Any suspected seizure should be evaluated by a pediatrician promptly. At 0-1 month, neonatal seizures are the most common neurological emergency in newborns and can be subtle. They may present as repetitive eye movements, lip smacking, cycling movements of the legs, or brief episodes of stiffening. Common causes include birth-related brain injury, low blood sugar, low calcium, infections, and genetic conditions. Any seizure-like activity in a newborn requires urgent evaluation, typically including bloodwork, brain imaging, and EEG monitoring. Early diagnosis and treatment are important for the best outcomes. It is generally considered normal when your baby has brief jitteriness when startled or cold that stops when you gently hold the limb - this is a normal startle reflex, not a seizure. However, you should contact your pediatrician promptly if your baby is having a seizure right now - place them on a safe surface on their side, do not put anything in their mouth, time the seizure, and call 911 if it lasts longer than 5 minutes or if this is the first seizure.

Sources: [1], [2], [3]

Normal vs. Concerning

Usually Normal
Worth Discussing
Your baby has brief jitteriness when startled or cold that stops when you gently hold the limb - this is a normal startle reflex, not a seizure
Your baby is having a seizure right now - place them on a safe surface on their side, do not put anything in their mouth, time the seizure, and call 911 if it lasts longer than 5 minutes or if this is the first seizure
Your baby has rhythmic movements during sleep that stop when woken - benign sleep myoclonus is not a seizure
Your baby has had a seizure and is not returning to their normal state afterward - prolonged confusion or sleepiness after a seizure (beyond 30 minutes) needs emergency evaluation
Your baby shivers or has a brief shuddering episode while awake and alert - shuddering attacks are benign
Your baby has repetitive episodes of sudden body jerks or head drops occurring in clusters - this pattern suggests infantile spasms which need urgent evaluation

When to Seek Immediate Care

  • Your baby is having a seizure right now - place them on a safe surface on their side, do not put anything in their mouth, time the seizure, and call 911 if it lasts longer than 5 minutes or if this is the first seizure
  • Your baby has had a seizure and is not returning to their normal state afterward - prolonged confusion or sleepiness after a seizure (beyond 30 minutes) needs emergency evaluation
  • Your baby has repetitive episodes of sudden body jerks or head drops occurring in clusters - this pattern suggests infantile spasms which need urgent evaluation

By Age

What to expect by age

0-1 month

Neonatal seizures are the most common neurological emergency in newborns and can be subtle. They may present as repetitive eye movements, lip smacking, cycling movements of the legs, or brief episodes of stiffening. Common causes include birth-related brain injury, low blood sugar, low calcium, infections, and genetic conditions. Any seizure-like activity in a newborn requires urgent evaluation, typically including bloodwork, brain imaging, and EEG monitoring. Early diagnosis and treatment are important for the best outcomes.

1-6 months

Seizures at this age may be caused by metabolic conditions, brain malformations, genetic epilepsy syndromes, or infections. Infantile spasms, a serious seizure type, typically begin between 3 and 8 months. They look like brief clusters of sudden jerking or stiffening - often the baby brings their arms forward and bends at the waist, similar to a startle reflex. These episodes tend to occur in clusters, often upon waking. If you notice this pattern, seek evaluation quickly, as early treatment of infantile spasms significantly improves outcomes.

6-12 months

Seizures without fever at this age are less common than febrile seizures but do occur. Some babies develop epilepsy that first presents during this period. Seizures may look like staring episodes where the baby becomes unresponsive, rhythmic jerking of one side of the body, or sudden loss of muscle tone causing the baby to drop their head or fall. Video recording a suspected seizure episode (when safe to do so) is extremely valuable for your pediatrician in making a diagnosis.

12-36 months

By this age, seizures are easier to recognize. Some children develop epilepsy syndromes during toddlerhood. Seizures may present as staring episodes, sudden falls, generalized shaking, or brief episodes of confusion. Some behaviors that parents worry about - like breath-holding spells, night terrors, or shuddering attacks - can look like seizures but are not. Your pediatrician can help distinguish between these. If your child has had one confirmed seizure without fever, an EEG and possibly brain imaging will typically be recommended.

What to Tell Your Pediatrician

  • Describe when you first noticed baby seizure without fever and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if you have seen an episode that might have been a seizure - unusual staring, repetitive movements, or sudden stiffening - even if your baby seems fine now.
  • Mention if your baby has episodes of sudden head dropping or brief body jerking that occur in clusters, especially upon waking.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

What Should You Do?

When to take action

Probably normal when...
  • Your baby has brief jitteriness when startled or cold that stops when you gently hold the limb - this is a normal startle reflex, not a seizure
  • Your baby has rhythmic movements during sleep that stop when woken - benign sleep myoclonus is not a seizure
  • Your baby shivers or has a brief shuddering episode while awake and alert - shuddering attacks are benign
Mention at your next visit when...
  • You have seen an episode that might have been a seizure - unusual staring, repetitive movements, or sudden stiffening - even if your baby seems fine now
  • Your baby has episodes of sudden head dropping or brief body jerking that occur in clusters, especially upon waking
  • Your baby has episodes of unresponsiveness or unusual eye movements that concern you
Act now when...
  • Your baby is having a seizure right now - place them on a safe surface on their side, do not put anything in their mouth, time the seizure, and call 911 if it lasts longer than 5 minutes or if this is the first seizure
  • Your baby has had a seizure and is not returning to their normal state afterward - prolonged confusion or sleepiness after a seizure (beyond 30 minutes) needs emergency evaluation
  • Your baby has repetitive episodes of sudden body jerks or head drops occurring in clusters - this pattern suggests infantile spasms which need urgent evaluation

What You Can Do at Home

  • Keep track of when you notice baby seizure without fever — noting the time of day, duration, and any triggers can help your pediatrician.
  • Remember that your baby has brief jitteriness when startled or cold that stops when you gently hold the limb - this is a normal startle reflex, not a seizure — this is generally within the range of normal.
  • At 0-1 month, focus on observation rather than intervention unless your pediatrician advises otherwise.
  • Follow any care instructions from your pediatrician. Keep a written log of symptoms to bring to appointments.
  • While monitoring at home, seek immediate care if your baby is having a seizure right now - place them on a safe surface on their side, do not put anything in their mouth, time the seizure, and call 911 if it lasts longer than 5 minutes or if this is the first seizure.

My Baby Had a Febrile Seizure

Febrile seizures are frightening to witness but are usually harmless. They affect about 1 in 25 children, typically between 6 months and 5 years, and almost never cause lasting harm. Most children who have one febrile seizure never have another, and they don't increase the risk of epilepsy significantly.

My Baby Has Jerky Movements

Newborns and young babies often have jerky, uncoordinated movements because their nervous systems are still developing. What looks like random flailing is actually your baby learning how their body works. These movements typically become smoother and more controlled by 3-4 months as motor skills mature.

My Baby Has Tremors

Brief tremors or shaking (especially of the chin, hands, or legs) are very common in newborns and usually completely harmless. They happen because your baby's nervous system is still developing and can be a bit jittery, especially when your baby is crying, cold, or just waking up. Most babies outgrow these tremors by 2-3 months.

Triage

Fever Decision Tree

Step-by-step guidance for evaluating your baby's fever by age and temperature.

Milestone

Month-by-Month Development

Detailed monthly development guides from birth through 24 months.

Guide

When to Call the Doctor

General guide on when to call the pediatrician, visit urgent care, or go to the ER.

Frequently asked questions

Is baby seizure without fever normal?
A seizure without fever in a baby is always a reason for medical evaluation. While febrile seizures (triggered by fever) are common and generally benign, seizures without fever can have various causes including low blood sugar, infections, brain injury, genetic conditions, or epilepsy syndromes like infantile spasms. Seizures in babies can look different from what you might expect - they may include staring spells, repetitive jerking of one limb, or brief full-body stiffening. Any suspected seizure should be evaluated by a pediatrician promptly.
When should I call the doctor about baby seizure without fever?
Your baby is having a seizure right now - place them on a safe surface on their side, do not put anything in their mouth, time the seizure, and call 911 if it lasts longer than 5 minutes or if this is the first seizure Your baby has had a seizure and is not returning to their normal state afterward - prolonged confusion or sleepiness after a seizure (beyond 30 minutes) needs emergency evaluation Your baby has repetitive episodes of sudden body jerks or head drops occurring in clusters - this pattern suggests infantile spasms which need urgent evaluation
When is baby seizure without fever normal?
Your baby has brief jitteriness when startled or cold that stops when you gently hold the limb - this is a normal startle reflex, not a seizure Your baby has rhythmic movements during sleep that stop when woken - benign sleep myoclonus is not a seizure Your baby shivers or has a brief shuddering episode while awake and alert - shuddering attacks are benign
What causes baby seizure without fever?
A seizure without fever in a baby is always a reason for medical evaluation. While febrile seizures (triggered by fever) are common and generally benign, seizures without fever can have various causes including low blood sugar, infections, brain injury, genetic conditions, or epilepsy syndromes like infantile spasms. Seizures in babies can look different from what you might expect - they may include staring spells, repetitive jerking of one limb, or brief full-body stiffening. Any suspected seizure should be evaluated by a pediatrician promptly. Common explanations include: Your baby has brief jitteriness when startled or cold that stops when you gently hold the limb - this is a normal startle reflex, not a seizure. Your baby has rhythmic movements during sleep that stop when woken - benign sleep myoclonus is not a seizure.
What should I mention to my pediatrician about baby seizure without fever?
You should mention baby seizure without fever at your next visit if: You have seen an episode that might have been a seizure - unusual staring, repetitive movements, or sudden stiffening - even if your baby seems fine now. Your baby has episodes of sudden head dropping or brief body jerking that occur in clusters, especially upon waking. Your baby has episodes of unresponsiveness or unusual eye movements that concern you.
Is baby seizure without fever normal at 0-1 month?
Neonatal seizures are the most common neurological emergency in newborns and can be subtle. They may present as repetitive eye movements, lip smacking, cycling movements of the legs, or brief episodes of stiffening. Common causes include birth-related brain injury, low blood sugar, low calcium, infections, and genetic conditions. Any seizure-like activity in a newborn requires urgent evaluation, typically including bloodwork, brain imaging, and EEG monitoring. Early diagnosis and treatment are important for the best outcomes.
Is baby seizure without fever normal at 1-6 months?
Seizures at this age may be caused by metabolic conditions, brain malformations, genetic epilepsy syndromes, or infections. Infantile spasms, a serious seizure type, typically begin between 3 and 8 months. They look like brief clusters of sudden jerking or stiffening - often the baby brings their arms forward and bends at the waist, similar to a startle reflex. These episodes tend to occur in clusters, often upon waking. If you notice this pattern, seek evaluation quickly, as early treatment of infantile spasms significantly improves outcomes.
Should I go to the ER for baby seizure without fever?
Seek emergency care if your baby is having a seizure right now - place them on a safe surface on their side, do not put anything in their mouth, time the seizure, and call 911 if it lasts longer than 5 minutes or if this is the first seizure, or if your baby has had a seizure and is not returning to their normal state afterward - prolonged confusion or sleepiness after a seizure (beyond 30 minutes) needs emergency evaluation. When in doubt, call your pediatrician's after-hours line for guidance.
Does baby seizure without fever go away on its own?
In many cases, baby seizure without fever resolves on its own, especially when your baby has brief jitteriness when startled or cold that stops when you gently hold the limb - this is a normal startle reflex, not a seizure. By 12-36 months, by this age, seizures are easier to recognize. Some children develop epilepsy syndromes during toddlerhood. Seizures may present as staring episodes, sudden falls, generalized shaking, or brief episodes of confusion. Some behaviors that parents worry about - like breath-holding spells, night terrors, or shuddering attacks - can look like seizures but are not. Your pediatrician can help distinguish between these. If your child has had one confirmed seizure without fever, an EEG and possibly brain imaging will typically be recommended.
AAPNIHCDC

References

  1. [1]American Academy of Pediatrics. Seizures and Epilepsy in Children. HealthyChildren.org. AAP
  2. [2]National Institute of Neurological Disorders and Stroke. Infantile Spasms. NIH
  3. [3]Centers for Disease Control and Prevention. Epilepsy in Children. CDC

Doctor Visit Checklist

Bring this checklist to your next pediatrician visit to discuss Baby Seizure Without Fever.

Things to mention

  • Describe when you first noticed baby seizure without fever and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if you have seen an episode that might have been a seizure - unusual staring, repetitive movements, or sudden stiffening - even if your baby seems fine now.
  • Mention if your baby has episodes of sudden head dropping or brief body jerking that occur in clusters, especially upon waking.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

Observations to share

  • You have seen an episode that might have been a seizure - unusual staring, repetitive movements, or sudden stiffening - even if your baby seems fine now
  • Your baby has episodes of sudden head dropping or brief body jerking that occur in clusters, especially upon waking
  • Your baby has episodes of unresponsiveness or unusual eye movements that concern you

Urgent signs to report immediately

  • Your baby is having a seizure right now - place them on a safe surface on their side, do not put anything in their mouth, time the seizure, and call 911 if it lasts longer than 5 minutes or if this is the first seizure
  • Your baby has had a seizure and is not returning to their normal state afterward - prolonged confusion or sleepiness after a seizure (beyond 30 minutes) needs emergency evaluation
  • Your baby has repetitive episodes of sudden body jerks or head drops occurring in clusters - this pattern suggests infantile spasms which need urgent evaluation

My notes

From ismybabyalright.com — free, evidence-based baby health guides

All content follows our editorial policy and is reviewed against published clinical guidelines.

2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members

Related Resources

Fever TriageEye Discharge TriageWell-Baby Visit PrepEarly Intervention DirectoryMedicine Dosage CalculatorBaby Sign Language GuideEmergency ContactsBaby Tracker

Bottom line

Most cases of baby seizure without fever are normal. Talk to your pediatrician if your baby is having a seizure right now - place them on a safe surface on their side, do not put anything in their mouth, time the seizure, and call 911 if it lasts longer than 5 minutes or if this is the first seizure.

Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.

Share:FacebookX

Was this page helpful?

Related Medical Concerns

My Baby Had a Febrile Seizure

Febrile seizures are frightening to witness but are usually harmless. They affect about 1 in 25 children, typically between 6 months and 5 years, and almost never cause lasting harm. Most children who have one febrile seizure never have another, and they don't increase the risk of epilepsy significantly.

My Baby Has Jerky Movements

Newborns and young babies often have jerky, uncoordinated movements because their nervous systems are still developing. What looks like random flailing is actually your baby learning how their body works. These movements typically become smoother and more controlled by 3-4 months as motor skills mature.

My Baby Has Tremors

Brief tremors or shaking (especially of the chin, hands, or legs) are very common in newborns and usually completely harmless. They happen because your baby's nervous system is still developing and can be a bit jittery, especially when your baby is crying, cold, or just waking up. Most babies outgrow these tremors by 2-3 months.

My Baby's Head Shape Looks Abnormal

Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.

Achondroplasia (Dwarfism) in Babies

Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.

Adenoid Hypertrophy and Breathing

Adenoids are lymphoid tissue located behind the nose that help fight infection in young children. When adenoids become enlarged (adenoid hypertrophy), they can block the nasal airway, causing chronic mouth breathing, snoring, nasal speech, and sleep-disordered breathing. Enlarged adenoids are most common between ages 2-7 and are a leading cause of obstructive sleep apnea in young children. Treatment ranges from watchful waiting and nasal steroids to surgical removal (adenoidectomy) if breathing or sleep is significantly affected.