Vomiting in Kids: Causes, Home Care and When to Call the Doctor

Quick answer: most vomiting in kids comes from a stomach virus and improves in one to three days with rest and small, frequent sips of clear fluid or oral rehydration solution. Stop solid food while they are actively vomiting, then restart with bland foods when they can keep liquids down. Call the doctor for blood in vomit, green or yellow bile, signs of dehydration, vomiting after a head injury, or a baby under three months who vomits forcefully. Go to the emergency room for severe dehydration, a stiff neck with fever, or vomiting that will not stop.

A child who is throwing up can turn a calm evening into a pile of towels and worried questions. Stomach viruses travel quickly through classrooms and playdates, and many otherwise healthy kids will have a short bout of vomiting each year. Knowing what to do in the first hours, how to protect against dehydration and which red flags matter keeps most of these nights manageable at home. This guide is part of our family health and safety guide, and it covers causes, home care and when to get help.

Sources: American Academy of Pediatrics (AAP) HealthyChildren.org guidance on vomiting and dehydration; Centers for Disease Control and Prevention (CDC) information on norovirus and diarrhea; MedlinePlus (National Library of Medicine). This article is general information, not medical advice. Call your child’s doctor with specific concerns.

Common Causes of Vomiting in Kids

Vomiting is a symptom, not a diagnosis. The lining of the stomach and the vomiting center in the brain react to infection, irritation, motion or other triggers.

Frequent causes include:

• Stomach viruses. Norovirus and other gastrointestinal viruses are among the most common. They often bring sudden vomiting, sometimes with diarrhea, stomach pain and a low fever.
• Food poisoning. Contaminated food can cause vomiting within hours. Other people who ate the same meal may get sick too.
• Ear infections, strep throat or sinus infections. Younger children sometimes vomit when they have a lot of mucus or when pain and fever upset the stomach.
• Motion sickness. Car rides, boats and amusement parks can trigger vomiting in sensitive kids.
• Coughing hard. A forceful cough can push stomach contents up, especially with whooping cough or a bad cold.
• Overeating or eating too fast. Excitement at parties and birthday cake can overwhelm a small stomach.
• Medicines and supplements. Some antibiotics and iron supplements upset the stomach. Ask the pharmacist before stopping a prescribed medicine.
• Migraines. In school-age children and teens, vomiting with a throbbing headache and light sensitivity can be a migraine pattern.

Less often, vomiting points to appendicitis, a urinary tract infection, a blockage, a head injury, diabetes or poisoning. Those situations usually come with other warning signs listed later in this guide.

What to Do in the First Hours

Stay calm. Children who are frightened often gag more. Clean them up, change clothes and keep a basin or bowl nearby.

1. Pause food. Do not force crackers or milk while they are still vomiting. An empty stomach needs a short rest.
2. Wait about 30 to 60 minutes after the last episode before offering fluid, unless your doctor has given different instructions for your child.
3. Start with tiny amounts. Offer a teaspoon or a few sips every few minutes. Large gulps often come right back up.
4. Use the right fluids. Oral rehydration solution (ORS) is the preferred choice for vomiting with diarrhea or for children who look dry. Clear fluids such as water, diluted apple juice (if your doctor agrees for older toddlers and children) or ice chips can work for short, mild spells. Avoid soda, sports drinks as the only fluid for young children, and undiluted juice in large amounts.
5. Keep breastfeeding. Nursing babies should continue to nurse. Offer shorter, more frequent feeds if needed. Formula-fed babies can take smaller bottles more often once vomiting slows.
6. Watch wet diapers and urine. Fewer wet diapers, dark urine or no tears when crying are early dehydration clues. Our guide to dehydration in kids explains mild, moderate and serious signs in more detail.
7. Rest. Quiet play, dim lights and sleep help more than screens in bed with a spinning stomach.

If your child vomits the small sips, pause again for 20 to 30 minutes and restart even smaller. Persistence with tiny amounts usually works better than waiting hours with nothing.

Fluids and Oral Rehydration

Dehydration is the main risk of vomiting, especially when diarrhea joins in. The AAP and CDC recommend oral rehydration solution for children with gastroenteritis because it replaces water and electrolytes in a balanced way.

Tips that help:

• Keep ORS on hand before anyone gets sick. Grocery and pharmacy shelves carry several brands as liquids or freezer pops.
• Offer ORS by spoon, syringe or small cup rather than a full bottle if your child resists.
• Do not mix homemade salt-and-sugar drinks unless a clinician gives exact amounts. Wrong ratios can be dangerous.
• Skip plain water as the only fluid for a toddler with a lot of diarrhea and vomiting, because water alone does not replace salts.
• Avoid anti-nausea medicine unless your child’s doctor specifically recommends it. Some products are not for young children.

Once your child keeps fluids down for several hours, you can slowly increase the amount. Continue ORS as the main drink until vomiting and diarrhea ease.

When to Restart Food

Hunger is a good sign. After fluids stay down for a few hours, offer small portions of familiar, easy foods.

Helpful choices for many kids:

• Toast, crackers or plain cereal
• Bananas or applesauce
• Rice or plain pasta
• Yogurt, if dairy usually sits well
• Chicken broth or a small amount of lean protein

The old BRAT diet (bananas, rice, applesauce, toast) is no longer the only plan. The AAP notes that children can return to a normal diet once they tolerate food, and that restricting food for days is not necessary for most stomach bugs. Fatty, fried and very sugary foods can wait a day. Dairy is fine for many children if it does not worsen diarrhea; follow your doctor’s advice for your child.

Do not worry if appetite is low for a day or two. Focus on fluids first. Calories can catch up when the stomach settles.

Caring for Babies and Toddlers

Babies under three months deserve a low threshold for calling the doctor. Forceful, projectile vomiting in a young infant can signal pyloric stenosis or another problem that needs prompt evaluation. Green or yellow vomit in a baby is an emergency until proven otherwise.

Toddlers often refuse cups when they feel awful. A syringe (without a needle) from the pharmacy, a spoon or frozen ORS pops can help. Watch for:

• Fewer than three wet diapers in 24 hours, or a dry diaper for six to eight hours
• A soft spot on the head that looks sunken
• Extreme sleepiness or irritability
• Cool hands and feet or mottled skin

Spitting up after feeds is different from true vomiting. Happy, growing babies who spit up small amounts without pain usually do not need the same treatment plan. Ask your pediatrician if you are unsure which pattern you are seeing.

Contagious Bugs and Household Cleanup

Norovirus and many stomach viruses spread easily through tiny particles of vomit and stool. You can catch them from shared surfaces, laundry and close contact.

Practical steps:

• Wash hands with soap and water after cleanup, diaper changes and before food. Alcohol gel is less effective against some stomach viruses than soap and water.
• Clean soiled surfaces with a product that lists norovirus or that your local health department recommends. Bleach solutions are often used on hard surfaces; follow label directions and keep children away from the wet surface.
• Wash contaminated clothes and linens promptly. Wear gloves if you can.
• Keep sick children home from school and childcare until they have been vomit-free for the time your school or program requires, often 24 hours. See our guide on when to keep your child home from school for broader sick-day rules.
• Do not share cups, utensils or towels while someone is ill.

Siblings may still get sick a day or two later. Having ORS ready softens the next round.

When to Call the Doctor

Call your child’s doctor or nurse advice line if:

• Vomiting lasts more than about 24 hours in a baby, or more than a couple of days in an older child, without clear improvement
• You see blood in the vomit, or material that looks like coffee grounds
• The vomit is green or bright yellow (bile), which can mean a blockage
• Your child cannot keep any fluids down and shows dehydration signs
• There is severe stomach pain, especially pain that moves to the lower right side
• Vomiting follows a head injury, even a mild-looking bump. Pair this with our concussion guide if symptoms include confusion, severe headache or unusual sleepiness
• A baby under three months has repeated vomiting or forceful projectile vomiting
• Fever with vomiting in a baby under three months, or a fever pattern your doctor has told you to report
• Your child has a chronic condition such as diabetes, kidney disease or a weakened immune system
• You suspect poisoning or a swallowed object. Call Poison Control at 1-800-222-1222 and follow their instructions

Fever care and timing rules are covered in our post on fever in kids and when to call the doctor.

When to Go to the Emergency Room

Seek emergency care or call 911 if:

• Severe dehydration: no urine for eight hours or more, sunken eyes, extreme sleepiness, cold or blotchy hands and feet, rapid breathing or a child who will not wake fully
• Stiff neck, severe headache and fever, which can signal a serious infection
• Vomiting blood in more than streaks, or repeated coffee-ground vomit
• Green vomit in an infant or child with severe pain and a swollen belly
• A head injury with repeated vomiting, unequal pupils, clear fluid from the nose or ears, or hard-to-rouse behavior
• Signs of a severe allergic reaction such as swelling of the lips or tongue, wheezing or widespread hives after a food or medicine
• Your gut says something is very wrong. Parents often notice subtle changes before numbers on a chart do

Bring a list of medicines, allergies and recent foods or exposures. If Poison Control directed you to the ER, tell the triage nurse that.

Mistakes to Avoid

Well-meant habits sometimes make vomiting harder to manage.

• Do not give large drinks right away. Tiny, frequent sips win.
• Do not use adult stomach medicines without asking a pharmacist or doctor.
• Do not give aspirin to children with viral illness because of the risk of Reye syndrome.
• Do not rely on soda or sports drinks alone for young children with a lot of diarrhea and vomiting.
• Do not keep a child on clear liquids for many days. Restart food when fluids stay down.
• Do not ignore a dry diaper streak while waiting for the virus to “run its course.”

A simple family first aid kit with ORS, a thermometer, gloves and clean cloths makes night-time cleanup easier. See our family first aid kit checklist for a fuller supply list.

Recovery and Return to Normal

Most stomach viruses ease within a few days. Energy and appetite return gradually. Keep offering fluids, wash hands often and ease back into regular meals. If diarrhea continues after vomiting stops, stay with ORS as needed and watch for dehydration.

Call again if new symptoms appear, such as a rash, ear pain, urinary burning or vomiting that restarts after a full day of feeling better. A second wave sometimes means a different problem, not the same virus.

Frequently Asked Questions

How long does vomiting usually last in kids?

Many stomach viruses cause vomiting for 12 to 72 hours. Call the doctor sooner for babies, dehydration or any red-flag signs listed above.

Should I give my child anti-nausea medicine?

Only if your child’s doctor recommends a specific product and dose. Do not use leftover adult medicines.

Is the BRAT diet still recommended?

It can be part of early meals, but children do not need to stay on bananas, rice, applesauce and toast for days. Return to a normal diet as tolerated.

Can my child go to school after vomiting?

Follow your school or childcare rule, often 24 hours without vomiting. When in doubt, keep them home and rest.

What is the best drink for a vomiting child?

Oral rehydration solution is preferred when there is a risk of dehydration. Tiny, frequent sips matter as much as the brand.

When is vomiting an emergency?

Severe dehydration, green vomit with severe pain, vomiting after a serious head injury, blood in vomit or a baby who is hard to wake all need emergency care.