Most childhood vomiting is caused by a stomach bug and will stop on its own within 12 to 24 hours. Your main job isn’t to stop the vomiting itself, but to keep your child hydrated while the illness runs its course. Small, frequent sips of the right fluids, starting at just 5 milliliters (one teaspoon) every five minutes, are the single most effective thing you can do at home.
Start With Small, Frequent Sips
The instinct is to let a vomiting child drink as much as they want once the vomiting pauses. This usually backfires. A stomach that’s irritated will reject large volumes immediately. Instead, wait about 15 to 30 minutes after the last vomit, then offer tiny amounts of clear fluid.
For babies and smaller children under 10 kg (roughly 22 pounds), give one teaspoon (5 mL) every five minutes. For larger children, you can go up to two teaspoons (10 mL) every five minutes. If your child keeps that down for 15 to 20 minutes, gradually increase the amount. The goal is slow and steady. Oral rehydration solutions are ideal because they replace both water and the salts lost through vomiting. You can find these at any pharmacy. Plain water is fine as a starting point, but it doesn’t replace electrolytes.
Avoid giving fruit juice, soda, or sports drinks. These are high in sugar and low in the sodium a dehydrated child actually needs, and the sugar can worsen diarrhea.
What Causes Vomiting at Different Ages
The most common cause across all age groups is gastroenteritis, a viral infection of the stomach and intestines. In babies, rotavirus is a frequent culprit. In school-aged children, norovirus is more typical. Both clear up without specific treatment.
Babies in their first year are also more likely to vomit from food allergies, particularly cow’s milk allergy, which can appear when you first introduce a new food. Toddlers face an additional risk: accidental poisoning. Young children put things in their mouths constantly, and household cleaners, medications, or small batteries can all trigger vomiting. If you suspect your child swallowed something toxic, that’s an emergency regardless of how well they seem. Motion sickness is another common trigger, but it’s more of an issue for older children than babies.
Urinary tract infections can also cause vomiting in young children, sometimes without any obvious urinary symptoms. If vomiting comes with a fever but no diarrhea, this is worth considering.
How to Spot Dehydration
Dehydration is the real danger with vomiting, not the vomiting itself. Knowing how to gauge its severity helps you decide whether to manage things at home or seek medical care.
Mild dehydration (less than 5% of body weight lost) looks like a slightly dry mouth but otherwise normal behavior. Your child is still making tears when crying, and their skin color is normal. This level responds well to the slow sipping approach described above.
Moderate dehydration (5 to 9% body weight loss) is more concerning. Your child’s mouth and lips look dry, they’re urinating less frequently, and they may seem unusually tired or fussy. If you press gently on their fingernail and release, the color takes longer than two seconds to return. At this stage, your child needs closer monitoring, and a call to your pediatrician or a visit to urgent care is a good idea.
Severe dehydration (10% or more) is a medical emergency. The signs include a markedly delayed return of color after pressing the skin, very dry mouth, no tears, sunken eyes, and a child who is limp or difficult to rouse.
When Vomiting Needs Emergency Care
Most vomiting resolves without medical intervention, but certain signs mean you should get to an emergency department immediately:
- Green or yellow-green vomit. This suggests bile, which can indicate a bowel obstruction.
- Blood in the vomit, or vomit that looks like dark coffee grounds. This points to bleeding somewhere in the digestive tract.
- Sudden, severe abdominal pain. Especially if the child can’t be distracted from it.
- Stiff neck, headache, or rash. These together can signal meningitis.
- A child who is floppy, unusually drowsy, or hard to wake.
- Possible poisoning. If you think your child swallowed a medication, cleaning product, or any unknown substance.
Also take note if vomiting has continued for more than 24 hours in a young child, or if your child simply cannot keep any fluids down despite the slow-sip approach. That’s the threshold where medical help becomes necessary to prevent serious dehydration.
When Medication Can Help
There is one anti-nausea medication widely recommended for children: ondansetron, sold under the brand name Zofran. It’s available as a dissolving tablet that goes on the tongue, which is helpful since a vomiting child can’t keep a swallowed pill down. Clinical guidelines recommend it as a single dose for children six months and older who have vomiting from a stomach bug and are becoming dehydrated or can’t keep fluids down.
A single dose is all that’s recommended. Studies show no added benefit from giving multiple doses, and the most common side effect is increased diarrhea, so it’s not the best choice if diarrhea is already the bigger problem. After giving the medication, wait 15 to 30 minutes before starting oral rehydration.
This is a prescription medication, so you’ll need to call your child’s doctor or visit an urgent care clinic to get it. Over-the-counter anti-nausea medications designed for adults should not be given to children unless specifically directed by a healthcare provider.
Reintroducing Food After Vomiting Stops
Once your child has stopped vomiting and is keeping clear fluids down, hold off on solid foods for about eight hours from when the vomiting started. During this window, stick to clear liquids only.
When you do reintroduce food, keep it bland and easy to digest: yogurt, bananas, rice, applesauce, and plain toast are all good choices. These foods are gentle on an irritated stomach and unlikely to trigger more nausea. Hold off on greasy, spicy, or heavy foods like pizza and burgers for a few days, even if your child is asking for them. Let their appetite guide the pace. A child who doesn’t want to eat much for a day or two after a stomach bug is completely normal, and pushing food too early often restarts the vomiting cycle.
For breastfed babies, continue breastfeeding. Breast milk is well tolerated and helps with both hydration and nutrition. For formula-fed babies, you can continue offering formula in smaller, more frequent amounts once the vomiting has settled.
Practical Tips for Comfort at Home
Position matters. If your child is lying down, keep them on their side rather than their back to prevent choking. For older children, sitting upright or leaning slightly forward during active vomiting is more comfortable and safer. Keep a bowl or bucket nearby so they don’t have to rush to the bathroom.
Cool, damp cloths on the forehead or back of the neck can help with the nausea that comes between vomiting episodes. Keep the room well ventilated, as stuffy air and strong smells can make nausea worse. Let your child rest as much as they want. Sleep is one of the most effective things for recovery, and many children will naturally sleep through much of a stomach bug if given the chance.
Track the timing. Note when each vomiting episode happens and when your child last urinated. This information is useful if you end up calling a doctor, and it also helps you gauge whether things are improving or getting worse. A child who is vomiting less frequently and starting to urinate normally is on the mend.