After your baby throws up, the most important steps are keeping their airway clear, replacing lost fluids slowly, and watching for signs that something more serious is going on. Most vomiting in babies is caused by a stomach virus or minor feeding issue and resolves on its own within 12 to 24 hours. But knowing what to do in those hours makes a real difference in how quickly your baby recovers.
Keep Your Baby Safe Right After
The immediate priority is preventing your baby from choking. Lay your baby on their left side, which helps keep the airway open and reduces the chance of inhaling vomit. If your baby is awake and alert, you can hold them upright against your chest. Avoid laying them flat on their back while they’re still actively gagging or spitting up.
Gently wipe their mouth and face with a soft cloth. If vomit got into their nose, use a bulb syringe to clear it. Then take a breath yourself. One episode of vomiting is common and usually not dangerous.
How to Rehydrate a Baby After Vomiting
Vomiting empties your baby’s stomach and pulls fluid from their body, so replacing that fluid is your main job for the next several hours. The key is going slow. Offering too much liquid at once can trigger another round of vomiting.
If you’re breastfeeding, wait about 15 to 20 minutes after the vomiting stops, then offer a short feeding. Breast milk is easy to digest and provides both fluid and calories. If your baby is formula-fed, start with small amounts of an oral rehydration solution (available at any pharmacy) rather than full bottles of formula. Offer about a teaspoon every few minutes. If your baby keeps that down for 30 to 60 minutes, you can gradually increase the amount. For babies who can drink, aim for roughly 5 milliliters per kilogram of body weight per hour as a starting point. That works out to about 1 to 2 teaspoons every few minutes for most infants.
If your baby vomits again, wait another 15 to 20 minutes and start over with even smaller sips. It often takes a few attempts.
When to Hold Off on Solid Foods
If your baby is old enough to eat solids, hold off for about eight hours after vomiting starts. Stick to clear liquids during that window. Once your baby can keep liquids down without vomiting, you can reintroduce gentle foods: bananas, plain rice cereal, applesauce, yogurt, or toast. These are easy on the stomach and unlikely to trigger more vomiting. Avoid anything greasy, spicy, or heavily seasoned for a day or two.
Signs of Dehydration to Watch For
Dehydration is the main risk when a baby is vomiting, especially for very young infants who have smaller fluid reserves. Check for these signs in the hours after vomiting:
- Fewer wet diapers than usual. Newborns up to 4 months old should have at least 6 wet diapers in a day. Babies 4 months and older should have at least 3. Anything below that is a concern.
- Dry mouth or lips. If your baby’s mouth looks sticky or parched, they need more fluid.
- No tears when crying. This is one of the clearest signs of dehydration in babies.
- A sunken soft spot. The fontanelle on top of your baby’s head may look noticeably dipped inward when they’re low on fluids.
- Unusual sleepiness or fussiness. A dehydrated baby may seem harder to wake or unusually irritable.
If you notice any of these, increase fluid intake and contact your pediatrician. Dark yellow or orange urine is another signal that your baby needs more fluids.
Red Flags That Need Immediate Attention
Most baby vomiting is harmless, but certain patterns signal something that needs urgent evaluation. Get medical help right away if you see:
- Green or yellow-green vomit. Bile-stained vomit can indicate a bowel obstruction, which is a medical emergency.
- Blood in the vomit. This can look red or like dark coffee grounds. Even a small amount with the very first episode of vomiting warrants a call to your doctor.
- Projectile vomiting. If your baby is forcefully ejecting milk or formula several feet, especially if it happens repeatedly after every feeding, this could point to pyloric stenosis (more on that below).
- A swollen or rigid belly. A distended abdomen along with vomiting can suggest a blockage.
- Vomiting that wakes your baby from sleep. This is considered a red flag by pediatric specialists and deserves prompt evaluation.
- Signs of shock or severe dehydration. Cold hands and feet, rapid breathing, extreme lethargy, or no wet diapers for 6 or more hours.
Projectile Vomiting in Young Babies
If your baby is between 3 and 6 weeks old and vomiting forcefully after every feeding, pyloric stenosis is worth knowing about. This condition happens when the muscle controlling the exit of the stomach thickens, blocking food from passing into the intestines. It’s rare in babies older than 3 months.
The pattern is distinctive: your baby eats eagerly, vomits forcefully within minutes, and then seems hungry again right away. You might even see wave-like ripples moving across your baby’s belly after a feeding. Over days, the vomiting gets worse rather than better, and your baby may stop gaining weight or become constipated because so little food is getting through. Pyloric stenosis requires a simple surgical fix and is very treatable, but it won’t resolve on its own. If this pattern matches what you’re seeing, call your pediatrician that day.
What to Do About Fever and Vomiting Together
If your baby has a fever alongside vomiting, getting a fever reducer to stay down can be frustrating. Liquid medications given by mouth often come right back up. Acetaminophen is available as a rectal suppository, which bypasses the stomach entirely. This can be a practical option when your baby can’t keep anything down. Ask your pediatrician about the right dose for your baby’s weight before using one.
Positioning for Sleep After Vomiting
If your baby needs to sleep after vomiting, the safest position is still on their back, per safe sleep guidelines. You can slightly elevate the head of the crib mattress by placing a thin, firm wedge underneath it (not a pillow in the crib). Propping your baby up after feeds and keeping them upright for 20 to 30 minutes before laying them down reduces the chance of another episode. Laying your baby on their left side during supervised, awake time can also help the stomach settle.
If your baby vomits only once or twice and then returns to their normal self, playing and feeding as usual, you’re likely dealing with something minor. Most stomach viruses run their course within a day or two. Keep offering fluids frequently, watch for those dehydration signs, and trust what you’re seeing. A baby who is alert, making wet diapers, and keeping down at least some fluids is generally on the right track.