Infant Vomiting With No Fever: A Pediatrician's Guide

Vomiting in a baby without fever is usually caused by overfeeding, reflux, or the first hours of a stomach bug, and most babies recover with small, frequent feedings. Call 911 if vomit looks bloody or green, or your baby is hard to wake. Call your pediatrician same day for any vomiting in a baby under 3 months, forceful repeated vomiting, or signs of dehydration.

Age-Banded Decision Tree

Spit-Up vs. Vomiting: How to Tell the Difference

The first step is figuring out whether your baby is vomiting or spitting up. They look similar but mean different things.

Spit-up is the easy flow of milk out of the mouth, usually with a burp and in small amounts, without distressing your baby. It is common in healthy infants, peaks around 4 months, and usually resolves by the first birthday. Pediatricians call these babies "happy spitters" because they keep gaining weight and seem comfortable.

Vomiting is the forceful expulsion of a larger volume. It usually upsets your baby, may come with crying, and can repeat. Forceful vomiting in a baby under 3 months always warrants a call to your pediatrician.

If your baby spits up after most feeds, gains weight steadily, and seems content, you are almost certainly looking at normal reflux, not vomiting.

Common Causes of Vomiting Without Fever in Babies

Overfeeding

In the first weeks of life, your baby's stomach is tiny. It holds about a teaspoon (5 mL) on day one, an ounce (about 30 mL) by day three, and roughly 4 to 5 ounces (120 to 150 mL) by 1 month. Even a little too much milk or formula can come right back up.

What helps: smaller, more frequent feedings, pacing the bottle, mid-feed and end-of-feed burps, and keeping your baby upright for about 20 to 30 minutes after a feed.

Reflux (GER and GERD)

Reflux is when the contents of the stomach travel back up into the food pipe. In babies, this happens because the muscle at the top of the stomach is still loose. Mild reflux is called GER (gastroesophageal reflux) and is normal in most infants. It typically peaks around 4 months and gets better by 12 months.

Reflux becomes a medical concern (GERD) when it leads to poor weight gain, distress with feeds, refusing to eat, choking or gagging during feeds, or vomiting that contains blood.

What helps for everyday reflux: paced bottle feeds with frequent burping and holding your baby upright for 20 to 30 minutes after meals.

Important safe-sleep note: Even if your baby has reflux, place them on their back to sleep on a flat, firm surface. Do not use inclined sleepers, wedges, or sleep positioners. This is the recommendation from the American Academy of Pediatrics (AAP) for all babies, including babies who spit up.

Pyloric Stenosis (Forceful Vomiting in Young Infants)

Pyloric stenosis is when the muscle at the bottom of the stomach thickens and narrows, so milk can't move into the intestines and gets forced back up. It is uncommon but important to catch.

What it looks like:

• Forceful, "projectile" vomiting that can launch milk 1 to 4 feet from your baby.
• Vomiting that happens after most feedings.
• Most often shows up between 2 and 8 weeks of age, but can start up to about 3 months.
• The vomit is white or yellowish (the milk), not green.
• Your baby seems hungry again right after vomiting.
• Weight loss or fewer wet diapers.

What to do: call your pediatrician the same day. The diagnosis may include an ultrasound, and a short, well-established surgery (pyloromyotomy) fixes the problem. Most babies go home within a day.

Stomach Bugs (Before the Fever Shows Up)

Viruses like norovirus and rotavirus often start with vomiting hours before any fever or diarrhea appears. In some young babies, fever never develops at all, which is one reason a stomach bug can hide behind a fever-free presentation. The vomiting phase usually lasts 12 to 24 hours, followed by 1 to 2 days of loose stools. Most viral stomach bugs in babies resolve in 1 to 3 days. Your main job is keeping fluids going in with small, frequent sips and watching for dehydration. Wash hands often during a household stomach bug; rotavirus and norovirus spread easily and the rotavirus vaccine series only starts at 2 months.

Food Protein-Induced Allergic Proctocolitis (FPIAP)

Food protein-induced allergic proctocolitis (FPIAP), formerly grouped under cow's milk protein allergy, is a delayed, non-IgE reaction in the lining of the lower intestine. It affects roughly 2 to 6 percent of infants and is not the same as a milk allergy.

• Typical symptoms are delayed (often 2 to 48 hours after feeding) and limited to blood-streaked or mucus-streaked stools in a baby who otherwise looks well. Some babies also have repeated spit-up, eczema, or slow weight gain.
• Hives, face or lip swelling, vomiting, or trouble breathing within minutes of a feed point to an immediate allergic reaction (anaphylaxis), not FPIAP. Call 911.

Do not start an elimination diet on your own. Talk to your pediatrician first. Changing formula or your own diet (if you're breastfeeding) without guidance can lead to nutritional gaps and missed diagnoses.

Motion Sickness

Motion sickness is uncommon under 2 years old because the inner-ear balance system is still developing. Some older babies and toddlers do get carsick, especially on winding roads or longer rides. The pattern is telltale: vomiting that happens only or mostly during car or boat rides, often after fussiness, yawning, paleness, or excessive drooling. Between trips, the baby is well, feeds normally, and has no fever. What helps: keep your baby looking forward, crack a window for cool air, time rides between feeds so the stomach is not full, and take breaks on longer trips. If your infant repeatedly vomits during car rides with no other symptoms, mention it to your pediatrician.

Intussusception (Uncommon but Serious)

Intussusception is when one part of the intestine slides into another, like a telescope folding in on itself. It is uncommon, but it is one of the more serious causes of vomiting in babies between 3 months and 3 years old, with the peak around 4 to 9 months.

What it looks like:

• Sudden episodes of severe crying about every 15 to 20 minutes, with your baby pulling their knees up to their chest.
• Vomiting (often the first sign).
• Between episodes, your baby may look pale, sleepy, or limp.
• A late sign is "currant jelly" stool (a mix of blood and mucus). This sign is not always present, so don't wait for it.

What to do: this needs an ER visit. Treatment is most successful when done quickly.

Red Flags: When Vomiting Is an Emergency

Some signs mean the issue is more than a stomach bug or overfeeding.

Call 911 or Go to the ER Right Now

• Vomit that contains bright red blood or looks like coffee grounds.
• Green or yellow-green (bile-stained) vomit.
• Vomiting after a fall or any head injury, especially with sleepiness, irritability, unequal pupils, or a bulging soft spot.
• A baby who is hard to wake, limp, or unresponsive.
• Trouble breathing, lip or face swelling, or hives after a feed (possible allergic reaction).
• Severe dehydration: sunken eyes, cool or mottled hands and feet, wrinkled or doughy skin, only 1 to 2 wet diapers in 24 hours, or capillary refill longer than 2 seconds.
• Sudden severe crying with knees pulled to chest plus vomiting, with or without blood or mucus in the stool (possible intussusception).

Call Your Pediatrician Today

• Any vomiting in a baby under 3 months old.
• Forceful "projectile" vomiting after most feedings, especially in a baby 2 weeks to 3 months old.
• Vomiting that happens when your baby is waking up from sleep.
• Vomiting that lasts more than 24 hours.
• Refusing fluids for 8 hours or more.
• Fewer than 6 wet diapers in 24 hours.
• Repeated vomiting in a baby who isn't gaining weight as expected.

How to Spot Dehydration in Your Baby

Vomiting itself is rarely the main problem. Dehydration is. The signs fall into two tiers. Early signs mean call your pediatrician. Severe signs mean go to the ER.

• Early sign: fewer than 6 wet diapers in 24 hours.
• Early sign: a dry or sticky mouth, parched lips, or no tears when crying.
• Early sign: a sunken soft spot on top of the head, or unusual fussiness.
• Severe sign: sunken eyes.
• Severe sign: cool or mottled hands and feet, wrinkled or doughy skin, or only 1 to 2 wet diapers in 24 hours.
• Severe sign: extreme sleepiness or hard to wake, or capillary refill longer than 2 seconds.

A simple bedside check is capillary refill: gently press your baby's fingertip or kneecap for 3 seconds, let go, and count how many seconds it takes for the color to come back. Longer than 2 seconds is a severe sign and means head to the ER.

What You Can Do at Home

For babies who are otherwise well, your job is to keep small amounts of fluid going in.

For breastfed babies: keep nursing, but offer shorter feeds more often. Continue breastfeeding through any viral illness.

For formula-fed babies: offer small amounts often. For the first hour after vomiting, try 1 to 2 teaspoons (5 to 10 mL) every 5 minutes. If your baby keeps that down, move up to 0.5 to 1 ounce every 10 to 15 minutes during the second hour, then slowly work back up to normal feeds.

Oral rehydration solution (ORS): for babies who are vomiting, your pediatrician may recommend small, frequent sips of an oral rehydration solution such as Pedialyte. ORS can be used in babies under 1 year when your pediatrician advises it. Plain water, juice, sports drinks, and soda are not safe substitutes for milk, formula, or ORS in young infants. In babies under 6 months, plain water in significant volumes can dangerously lower a baby's sodium level (hyponatremia).

Upright after feeds: hold your baby upright for about 20 to 30 minutes after a feed to reduce reflux-related spit-up.

Sleep: always put your baby down on their back, on a flat firm surface. No inclined sleepers, no wedges, no positioners, even for babies with reflux.

What not to do: don't give over-the-counter anti-nausea medicines or anti-diarrheal medicines to infants. Don't dilute formula with extra water (this can be dangerous). Don't switch formulas or remove dairy from a breastfeeding parent's diet without your pediatrician's input.

When to Talk to Your Pediatrician

You don't need a red-flag sign to call. Call your pediatrician whenever:

• You feel like something is "off" with your baby.
• Vomiting has been going on for more than 24 hours.
• Your baby isn't keeping fluids down.
• You see fewer wet diapers than usual.
• Your baby is younger than 3 months and has vomited even once.
• You're not sure whether what you're seeing is spit-up or vomiting.

In our 24/7 telehealth practice, vomiting without fever in a baby under 3 months is one of the most common after-hours messages we get, and one of the most straightforward to evaluate over video when parents can show the vomit color and the baby's alertness. If you're a Blueberry Pediatrics family, you can message your pediatrician day or night through the app and send a quick video, photo, or otoscope check.

Frequently Asked Questions

Why is my baby vomiting but has no fever?

The most common reasons are overfeeding, normal reflux, and the early hours of a stomach virus before fever has had time to develop. Less common causes include cow's milk protein allergy, pyloric stenosis in young infants, motion sickness in older babies, and (rarely) intussusception. If your baby is under 3 months, if vomiting is forceful and repeated, or if there are any red-flag signs, call your pediatrician.

What is the difference between spit-up and vomiting in babies?

Spit-up is an easy, dribbling flow of stomach contents out of the mouth, usually with a burp, in small amounts, and without upsetting your baby. Vomiting is forceful expulsion of a larger volume and usually upsets your baby. Spit-up is common, peaks around 4 months, and resolves by 12 months in most infants. Forceful vomiting in a young baby is a reason to call your pediatrician.

When should I worry about my baby's vomiting?

Call 911 or go to the ER if vomit contains blood or looks green, if vomiting follows a head injury, if your baby is hard to wake, or if you see severe dehydration (sunken eyes, only 1 to 2 wet diapers in 24 hours, cool or mottled hands and feet, or capillary refill longer than 2 seconds). Call your pediatrician the same day for any vomiting in a baby under 3 months, forceful projectile vomiting, vomiting on waking, fewer than 6 wet diapers in 24 hours, a sunken soft spot, dry mouth or no tears, refusing fluids for 8 or more hours, or vomiting that lasts more than 24 hours.

How do I know if my baby is dehydrated?

Watch for fewer than 6 wet diapers in 24 hours (or no urine for 8 or more hours), a dry or sticky mouth, no tears when crying, a sunken soft spot, and unusual sleepiness or fussiness. Capillary refill longer than 2 seconds is another reliable check. Sunken eyes, cool or mottled hands and feet, or only 1 to 2 wet diapers in a day are signs of severe dehydration and need emergency care.

What is projectile vomiting and when is it serious?

Projectile vomiting is forceful enough to launch stomach contents 1 to 4 feet from your baby. When it happens after most feedings in a baby usually 2 to 8 weeks old (occasionally up to about 3 months), it can be a sign of pyloric stenosis, a narrowing of the muscle at the bottom of the stomach. The baby is usually hungry again right after vomiting, and parents may see weight loss or fewer wet diapers. Call your pediatrician the same day. Diagnostic workup may include an ultrasound, and a short surgery fixes it.

Can teething cause vomiting in babies?

Teething itself does not cause true vomiting. The extra drool from teething can cause a little extra spit-up or an occasional gag, but persistent vomiting, multiple episodes, or any of the red-flag signs above are not caused by teething and need medical evaluation.

Can my baby have a stomach bug without a fever?

Yes. Viruses such as norovirus and rotavirus often start with vomiting hours before any fever appears, and in some young babies fever never shows up at all. Most viral stomach bugs in infants run their course in 1 to 3 days, and the main job at home is keeping your baby hydrated.

Get a Pediatrician on Demand

Vomiting episodes almost always happen at 2 a.m. on a Sunday. Blueberry Pediatrics gives you 24/7 access to a board-certified pediatrician through your phone, plus a kit with an otoscope, thermometer, and pulse oximeter so your doctor can actually see and hear what's going on. No urgent-care lines, no copays per visit, no waiting until Monday.

References

1. American Academy of Pediatrics, HealthyChildren.org. "Causes of Vomiting in Infants & Children." Last updated December 29, 2024.
2. American Academy of Pediatrics, HealthyChildren.org. "Hypertrophic Pyloric Stenosis: Help for Babies with Forceful Vomiting." Last updated October 6, 2022.
3. American Academy of Pediatrics, HealthyChildren.org. "Signs of Dehydration in Infants & Children." Last reviewed September 24, 2019.
4. American Academy of Pediatrics, HealthyChildren.org. "Treating Dehydration with Electrolyte Solution." Last reviewed February 6, 2023.
5. Seattle Children's Hospital. "Vomiting (0-12 Months)." Last reviewed May 1, 2025.
6. Merck Manual Consumer Version. "Vomiting in Infants and Children." Modified March 2025.
7. Rosen R, et al. Pediatric Gastroesophageal Reflux Clinical Practice Guidelines: Joint Recommendations of NASPGHAN and ESPGHAN. Journal of Pediatric Gastroenterology and Nutrition. 2018;66(3):516-554. PMC5958910.
8. NIH / NCBI StatPearls. "Pyloric Stenosis." Bookshelf NBK555931.
9. Mayo Clinic. "Intussusception." Patient education page. Last reviewed August 19, 2025. https://www.mayoclinic.org/diseases-conditions/intussusception/symptoms-causes/syc-20351452
10. Vandenplas Y, et al. "Guidelines for the Diagnosis and Management of Cow's Milk Protein Allergy in Infants." PMC2083222.
11. Caffarelli C, et al. "Cow's Milk Protein Allergy in Children: A Practical Guide." Italian Journal of Pediatrics. 2010. PMC2823764.