Childhood Vomiting: Causes, Safe Home Care, Dehydration, and When to Get Help

Your child suddenly throws up.

Then it happens again.

You start wondering what caused it.

You also wonder what your child should drink.

And you may worry about dehydration.

Childhood vomiting is very common.

Most episodes are caused by a short viral illness and improve on their own.

But vomiting can also happen with food poisoning, migraine, motion sickness, infection, allergy, appendicitis, head injury, or a bowel problem.

The safest approach is simple.

Watch the child.

Replace lost fluids.

Know the warning signs.

This guide explains common causes, safe home care, oral rehydration, dehydration, food, medicines, green vomit, blood in vomit, repeated vomiting, and when to call the doctor.

For a wider overview of common childhood illnesses, visit our Childhood Illnesses 101 Guide.

You can also visit the main Child Health and Safety Guide.

What is childhood vomiting?

Vomiting in children means stomach contents are pushed back up and out through the mouth.

Vomiting is different from nausea.

Nausea is the feeling that you may vomit.

Vomiting is also different from normal baby spit up.

A single vomit can happen for a simple reason.

Repeated vomiting needs closer attention because children can lose fluid quickly.

What is the difference between vomiting and spit up?

Babies often spit up after feeds.

Spit up usually comes out easily.

The baby often remains comfortable.

Normal reflux is common during infancy.

Vomiting is usually more forceful.

The baby may gag, retch, cry, or look uncomfortable.

Repeated forceful vomiting is not normal reflux.

What causes childhood vomiting?

There are many causes.

The most common are mild.

A few need urgent care.

The pattern of symptoms helps narrow the cause.

Viral gastroenteritis

Viral gastroenteritis is one of the most common causes of childhood vomiting.

People often call it stomach flu.

That name is not medically correct.

Influenza viruses do not cause viral gastroenteritis.

Common symptoms include:

• Vomiting
• Watery diarrhea
• Stomach cramps
• Nausea
• Sometimes fever

Many viruses can cause it.

Norovirus is one common cause.

Most children get better without a specific medicine.

How long does vomiting from a stomach virus last?

NICE guidance says vomiting from gastroenteritis usually lasts about 1 or 2 days.

In most children it stops within 3 days.

Diarrhea often lasts longer.

Call the healthcare professional when vomiting lasts longer than expected or the child is getting worse.

Food poisoning

Food poisoning can cause sudden vomiting.

Diarrhea and stomach cramps may happen too.

Symptoms can begin soon after a contaminated food or several hours later.

Some food borne infections cause fever.

Blood in stool, severe pain, dehydration, or a very sick child needs medical advice.

Motion sickness

Motion sickness in children can cause nausea, sweating, paleness, dizziness, and vomiting during car, boat, or amusement ride travel.

It often improves when the motion stops.

Repeated vomiting outside travel suggests another cause.

Food allergy

A food allergy can cause vomiting.

It may happen with:

• Hives
• Lip swelling
• Tongue swelling
• Wheezing
• Throat tightness
• Faintness

Vomiting with breathing trouble, swelling, or faintness can be anaphylaxis.

Use prescribed epinephrine if your child's allergy plan says to use it and call emergency services.

Read our Common Childhood Food Allergies Guide.

Other food related vomiting

Some children have delayed food reactions that cause repeated vomiting without hives.

Food intolerance can also cause stomach symptoms.

Repeated vomiting after the same food needs medical review.

Do not remove many foods from a child's diet without professional advice.

Ear, throat, urine, and lung infections

Vomiting does not always come from the stomach.

Children may vomit during other infections.

Examples include:

• Ear infection
• Strep throat
• Urinary tract infection
• Pneumonia
• Flu

Fever, ear pain, sore throat, cough, breathing changes, or painful urination can give clues.

Read our Childhood Ear Infections Guide, Childhood Strep Throat Guide, and Pneumonia in Children Guide.

Fever with vomiting

Fever can occur with stomach infection and many other childhood illnesses.

The age of the child matters.

A baby younger than 3 months with a temperature of 38 degrees Celsius or 100.4 degrees Fahrenheit or higher needs prompt medical assessment.

Read our Childhood Fever Guide.

Migraine

Migraine in children can cause nausea and vomiting.

A child may also have:

• Headache
• Light sensitivity
• Sound sensitivity
• Paleness
• Need for sleep

Some children have migraine related stomach symptoms even when head pain is mild.

Read our Childhood Headaches Guide.

Cyclic vomiting syndrome

Cyclic vomiting syndrome in children causes repeated episodes of severe vomiting that follow a similar pattern.

The child may be completely well between episodes.

Some children also have a personal or family history of migraine.

Repeated patterned episodes need medical assessment.

Do not assume they are repeated stomach bugs.

Stress and anxiety

Anxiety can cause nausea and vomiting in some children.

This may happen before school, travel, tests, or stressful events.

But anxiety should not be used to explain repeated vomiting until medical causes have been considered.

Weight loss, night waking, dehydration, blood, green vomit, fever, severe pain, or neurologic symptoms need medical review.

Appendicitis

Appendicitis in children can cause vomiting.

Pain often becomes more important than the vomiting.

The pain may start near the middle of the belly and later move toward the lower right side.

The child may have fever, poor appetite, and pain with movement.

Do not press hard on the abdomen to test for appendicitis.

Get medical care for worsening or local belly pain.

Read our Childhood Appendicitis Guide.

Bowel obstruction

A blocked intestine can cause vomiting.

This is an emergency.

Warning signs can include:

• Green vomit
• Severe belly pain
• A swollen abdomen
• Repeated vomiting
• Little or no stool or gas
• A child who looks very ill

What does green vomit mean?

Bilious vomiting is true green vomit.

It can mean bile is coming from the intestine.

NICE lists green vomit as a warning sign for a diagnosis other than simple gastroenteritis.

In a baby or child, green vomit can signal bowel blockage.

Get urgent medical care.

Do not wait for another episode.

Is yellow vomit the same as green vomit?

No.

Yellow stomach fluid can appear after repeated vomiting when the stomach is empty.

True bile is usually green.

If you are not sure what color you are seeing, take a photo if it is safe and call a healthcare professional.

Intussusception

In babies and toddlers, a bowel problem called intussusception can cause episodes of severe pain and vomiting.

The child may pull the legs up, cry suddenly, then become quiet between episodes.

Some children become unusually sleepy.

Blood or mucus can appear in the stool.

This needs urgent medical care.

Forceful vomiting in a young infant

Projectile vomiting in an infant needs medical assessment.

A young baby who repeatedly vomits feeds with force may have a stomach outlet problem such as pyloric stenosis.

This can cause dehydration and poor weight gain.

Repeated forceful vomiting is different from normal spit up.

Vomiting after a head injury

Vomiting after a head injury can be a concussion warning sign.

Repeated vomiting is more concerning.

Also watch for:

• Severe or worsening headache
• Confusion
• Difficulty walking
• Unusual sleepiness
• Seizure
• Weakness

Seek urgent medical care when these signs occur.

Read our Child First Aid Tips Guide.

Poisoning or swallowed object

Vomiting can happen after poisoning or swallowing an object.

If you think your child swallowed medicine, a chemical, a battery, a magnet, or another dangerous object, contact your local poison service or emergency service immediately.

Do not make the child vomit unless a medical professional specifically tells you to.

Diabetes emergency

Vomiting can be a sign of diabetic ketoacidosis.

This can happen when diabetes is new or when diabetes is not under control.

Warning signs can include:

• Very strong thirst
• Frequent urination
• Weight loss
• Stomach pain
• Deep or fast breathing
• Fruity-smelling breath
• Extreme tiredness

This is an emergency.

Read our Childhood Obesity and Type 2 Diabetes Guide for diabetes warning signs.

When is childhood vomiting an emergency?

What does blood in vomit mean?

Blood in vomit needs medical assessment.

Bright red blood can come from the mouth, nose, throat, esophagus, or stomach.

Repeated forceful vomiting can sometimes irritate the upper digestive tract.

Dark material that looks like coffee grounds can be digested blood.

Do not assume blood is harmless.

What is the main danger from repeated vomiting?

The main common complication is dehydration in children.

Vomiting removes water and electrolytes.

Young children become dehydrated faster than adults.

The risk is higher when vomiting happens with diarrhea or fever.

What are signs of dehydration?

Watch for:

• Less urine than normal
• Fewer wet diapers
• Dark urine
• Dry mouth
• Few or no tears
• Sunken eyes
• Unusual sleepiness
• Weakness
• Dizziness when standing in older children

Severe dehydration can lead to shock.

What are signs of severe dehydration or shock?

Get urgent medical help if your child has:

• Very little or no urine
• Cold hands and feet
• Pale or mottled skin
• Very weak response
• Extreme sleepiness
• Fast breathing
• Fainting

What is the safest home treatment for childhood vomiting?

Childhood vomiting treatment at home focuses on fluids and comfort.

Do not try to stop every vomit with medicine.

Do not force large drinks.

Do not withhold all fluids for hours.

The older version of this article advised resting the stomach without food or drink for a few hours.

That can increase dehydration risk.

Small frequent fluids are safer.

Give small amounts often

A child who drinks a full cup quickly may vomit again.

Try a few small sips every few minutes.

If that stays down, slowly increase the amount.

A medicine syringe, spoon, cup, or oral rehydration ice pop may help.

What is oral rehydration solution?

Oral rehydration solution, also called ORS, contains water, sugar, and salts in a balance designed to replace fluid losses.

It is especially useful when a child is vomiting repeatedly or also has diarrhea.

Use a commercial product prepared according to its instructions.

Do not make a strong or weak mixture by guessing.

What should babies drink?

Continue breastfeeding.

Breast milk is appropriate during vomiting illness.

Formula-fed babies can often continue formula in smaller feeds when vomiting is mild.

If repeated vomiting makes normal feeds hard to keep down, ask the pediatrician about a commercial oral rehydration solution.

Do not use plain water as the main replacement drink for a young infant.

What should older children drink?

For mild illness, water and usual fluids can be useful.

When vomiting is repeated, or diarrhea is present, oral rehydration solution is often the better choice.

Small frequent sips are more important than one large drink.

Are sports drinks good for vomiting?

Sports drinks are not the same as oral rehydration solution.

They may contain too much sugar and may not have the right balance of salts.

They can make diarrhea worse in some children.

Use oral rehydration solution when dehydration risk is significant.

What about juice and soda?

Full strength fruit juice and fizzy drinks are not good rehydration choices when vomiting happens with diarrhea.

The high sugar content can make diarrhea worse.

For children older than 1 with mild vomiting who refuse oral rehydration solution, a clinician may sometimes suggest another diluted drink.

The child's age and symptoms matter.

Should I wait hours before giving fluid?

No.

Start with small amounts rather than withholding all fluid.

Waiting for hours can make dehydration worse.

If every tiny sip comes back up for hours, contact a healthcare professional.

What if my child vomits oral rehydration solution?

Wait a short time.

Then try a smaller amount.

Give it more slowly.

Many children vomit once when they first start drinking again.

Persistent vomiting of even small amounts needs medical advice.

Should I stop breastfeeding?

No.

Continue breastfeeding during gastroenteritis and vomiting illness.

Offer shorter feeds more often if needed.

Should I stop formula?

Not automatically.

Infants can usually return to normal full-strength formula when they can tolerate feeds.

Do not routinely dilute formula unless the child's healthcare professional tells you to.

When can my child eat again?

During active repeated vomiting, fluids are the priority.

Once vomiting settles and appetite returns, let your child return to normal age-appropriate food.

You do not need to keep a child on a restricted diet for days.

Is the BRAT diet recommended?

No special BRAT diet is required.

Bananas, rice, applesauce, and toast are fine foods if your child likes them.

But they do not provide all the nutrition a recovering child needs.

NIDDK notes that restricted diets do not improve viral gastroenteritis.

Return to the child's normal balanced diet as appetite returns.

What foods are easy after vomiting?

Start with small portions.

Good choices can include:

• Toast
• Rice
• Oatmeal
• Soup
• Potato
• Yogurt
• Eggs
• Fruit
• Other normal family foods

There is no need to force a child to eat.

Should dairy be avoided?

No universal dairy ban is needed.

Breast milk and formula should continue for infants.

Older children can usually return to their normal milk or yogurt when tolerated.

Some children have temporary lactose sensitivity after gastroenteritis.

Ask the pediatrician if diarrhea continues after dairy.

Can ginger help?

Ginger may help nausea in some older children.

But it is not necessary.

Ginger ale is often high in sugar and is not a good replacement for oral rehydration solution.

Do not use herbal products as a substitute for fluids or medical care.

Should I give an anti nausea medicine?

Do not give an over the counter or prescription anti nausea medicine unless it was specifically recommended for your child and this illness.

The cause of vomiting matters.

Some medicines are not suitable for young children.

Some can hide important symptoms.

Should I give antibiotics?

Not for routine viral vomiting.

Antibiotics do not treat viruses.

NICE advises against routine antibiotics for gastroenteritis.

They are used only for selected bacterial infections or complications.

What about diarrhea medicine?

Do not give adult diarrhea medicines to a child unless a clinician tells you to.

Some are unsafe in children.

They also do not replace oral rehydration.

If vomiting happens with diarrhea, read our Childhood Diarrhea Guide.

How do I stop a stomach virus spreading?

Vomiting from norovirus and other stomach viruses spreads easily.

Wash hands well with soap and water.

Clean vomit safely.

Do not share towels, cups, or utensils.

Wash soiled clothing and bedding.

Clean bathroom surfaces.

Does hand sanitizer kill norovirus well?

Hand sanitizer can be useful for many germs.

But soap and water are especially important for norovirus.

Wash hands after cleaning vomit, changing diapers, using the toilet, and before preparing food.

When can my child return to school?

If vomiting is caused by gastroenteritis, follow local school rules.

NHS guidance says children with vomiting or diarrhea should stay away from school until at least 48 hours after the last episode.

The child should also feel well enough to take part in the school day.

Other causes of vomiting may have different return rules.

How do I know if vomiting is getting better?

Good signs include:

• Longer gaps between vomiting episodes
• Fluids staying down
• More urine
• Better energy
• Appetite slowly returning
• No new severe pain

When should vomiting duration worry me?

With simple gastroenteritis, vomiting usually lasts 1 to 2 days and should usually stop within 3 days.

Call the healthcare professional when it lasts longer.

Call earlier for a baby, dehydration, severe pain, green vomit, blood, head injury, or a child who looks very ill.

When should I call the pediatrician today?

Call for medical advice if:

• Your child cannot keep enough fluid down
• Urine is clearly reduced
• Vomiting is frequent
• Vomiting is lasting longer than expected
• There is fever with a very unwell child
• There is significant belly pain
• Your child has an important chronic medical condition
• Your child is an infant
• You are worried that the child is getting worse

What about a baby younger than 12 weeks?

Vomiting in a very young infant deserves a low threshold for medical assessment.

The American Academy of Pediatrics symptom guidance advises urgent medical review for a baby younger than 12 weeks who vomits 2 or more times, apart from normal spit up.

Fever in a baby this age also needs prompt medical assessment.

Common childhood vomiting myths

Myth: Stop all food and drink for several hours

False.

Fluids should not be withheld for hours.

Give small amounts often.

Myth: Water alone is always enough

False.

Repeated vomiting can cause loss of salts as well as water.

Oral rehydration solution is often better when losses are significant.

Myth: Sports drinks are the same as oral rehydration solution

False.

They have a different balance of sugar and salts.

Myth: A child must stay on bananas and rice for days

False.

Return to a normal age-appropriate diet when appetite returns.

Myth: Green vomit is just an empty stomach

False.

True green vomit can be bile and may signal bowel obstruction.

It needs urgent medical care.

Myth: Anti-nausea medicine is always safe

False.

Use medicine only when a clinician recommends it for your child.

Myth: Vomiting with anxiety never needs medical review

False.

Repeated vomiting should not automatically be blamed on stress.

Myth: If a child stops vomiting, dehydration is no longer a concern

False.

Fluid losses can remain important after the last vomit.

Continue watching urine, drinking, energy, and mouth dryness.

What should I tell the doctor?

It helps to note:

• Your child's age
• When vomiting started
• How many times the child vomited
• The colour of the vomit
• Whether blood was present
• Whether diarrhea is present
• The child's temperature
• Where the belly hurts
• How much the child is drinking
• When the child last urinated
• Any recent head injury
• New medicines
• Possible food exposure
• Possible poison or object ingestion
• Whether anyone else is sick

My parenting perspective

After more than 33 years of parenting and grandparenting, I have learned that vomiting looks dramatic even when the cause is mild.

The mess can distract us from the most important question.

Is the child staying hydrated?

I watch the urine.

I watch the mouth and tears.

I watch whether small sips stay down.

I also pay attention to the colour of the vomit.

Green vomit is not something I would wait on.

Blood is not something I would ignore.

And severe local belly pain changes the situation.

I have also learned not to starve the stomach for hours.

Small fluids matter early.

Once vomiting settles and appetite returns, normal food can come back.

My family experience shapes the practical side of this guide.

The medical information comes from current pediatric, digestive health, hospital, and public health guidance.

Conclusion

Childhood vomiting is usually short-lived and caused by a common stomach infection.

The main job at home is to prevent dehydration.

Offer small amounts of fluid often.

Continue breastfeeding.

Use oral rehydration solution when fluid losses are significant.

Return to normal food when appetite returns.

Do not rely on restricted diets, sports drinks, or unapproved anti nausea medicines.

Get urgent help for green vomit, blood, severe belly pain, abdominal swelling, severe dehydration, confusion, a stiff neck, vomiting after a serious head injury, suspected poisoning, or repeated forceful vomiting in a young infant.

If your child cannot keep small sips down or is urinating much less than normal, contact the pediatrician today.

Keep Reading on Parnthub

• Child Health and Safety Guide
• Childhood Illnesses 101
• Childhood Diarrhea
• Childhood Fever
• Childhood Appendicitis
• Childhood Headaches
• Common Childhood Food Allergies
• Child First Aid Tips
• When to Call the Pediatrician

References and Sources

1. American Academy of Pediatrics, HealthyChildren: Treating Vomiting
2. American Academy of Pediatrics, HealthyChildren: Drinks to Prevent Dehydration When Your Child Is Vomiting
3. NICE: Diarrhea and Vomiting Caused by Gastroenteritis in Children Under 5
4. National Institute of Diabetes and Digestive and Kidney Diseases: Viral Gastroenteritis Symptoms and Causes
5. Centers for Disease Control and Prevention: About Norovirus

Frequently Asked Questions About Childhood Vomiting

What is the most common cause of vomiting in children?

A short viral stomach infection is one of the most common causes. It may also cause diarrhea, stomach cramps, nausea, and fever. Vomiting from gastroenteritis usually stops within 1 to 3 days.

What should I give my child after vomiting?

Offer small amounts of fluid often. Continue breastfeeding. When vomiting is repeated or diarrhea is present, a commercial oral rehydration solution is often the best choice. Increase the amount slowly when fluids stay down.

Should I stop food and drinks after my child vomits?

Do not stop all fluids for hours. Give small frequent sips to prevent dehydration. During active vomiting, fluids are more important than solid food. Return to normal age-appropriate food when vomiting eases and appetite returns.

What does green vomit mean in a child?

True green vomit can contain bile and may signal a bowel blockage. Green vomit in a baby or child needs urgent medical assessment.

When is blood in vomit an emergency?

Blood in vomit needs medical assessment. Get urgent help for a large amount of blood, repeated bleeding, coffee ground material, severe pain, fainting, unusual sleepiness, or a child who looks very ill.

How do I know if my child is dehydrated?

Signs include less urine, fewer wet diapers, a dry mouth, few tears, sunken eyes, weakness, dizziness, and unusual sleepiness. Severe dehydration needs urgent medical care.

How long should childhood vomiting last?

Vomiting from simple gastroenteritis usually lasts 1 or 2 days and stops within 3 days in most children. Seek medical advice if it lasts longer or if your child is becoming dehydrated or more unwell.

When should childhood vomiting be treated as an emergency?

Get urgent help for green vomit, blood, severe or local belly pain, a swollen abdomen, severe dehydration, confusion, a stiff neck, seizure, serious breathing trouble, repeated vomiting after a head injury, suspected poisoning, or forceful repeated vomiting in a young infant.