Baby Vomiting Without Fever
The short answer
Vomiting without fever in babies has many possible causes, and most are not serious. Common reasons include overfeeding, reflux, food intolerance, motion sickness, or a sensitive gag reflex. However, certain patterns - forceful projectile vomiting in a young infant, bile-stained (green) vomit, or vomiting that prevents any fluid intake - can signal conditions that need prompt medical attention.
By Age
What to expect by age
Spitting up is very common in young infants and is different from true vomiting. Spit-up flows out gently while vomiting is forceful. If your newborn is vomiting (not just spitting up) without fever, reflux is the most common cause. However, forceful projectile vomiting in a baby 2-8 weeks old - where vomit shoots several inches - can be a sign of pyloric stenosis, where the muscle at the stomach's exit thickens and blocks food. Pyloric stenosis requires urgent evaluation. Green or bile-stained vomit at any age needs immediate attention.
Reflux-related vomiting typically peaks around 4 months and gradually improves. If your baby vomits occasionally after feeds but is gaining weight and generally happy, this is likely normal reflux. Formula-fed babies may vomit more with certain formulas. If vomiting increases in frequency or force, or your baby is losing weight, discuss the possibility of significant reflux or formula intolerance with your pediatrician.
As babies start solids, new vomiting triggers emerge. Some babies vomit in response to specific foods due to FPIES (food protein-induced enterocolitis syndrome), which causes delayed vomiting 2-4 hours after eating a trigger food. Common triggers include milk, soy, rice, and oats. Some babies have a strong gag reflex with new textures that triggers vomiting during meals - this usually improves with time.
Toddlers may vomit without fever from motion sickness, eating too quickly, food intolerances, intense crying, or constipation. Acid reflux can persist into toddlerhood. If vomiting is a single episode followed by normal behavior, it is usually nothing to worry about. Repeated vomiting without obvious cause, progressive worsening, or vomiting with lethargy or headache should be evaluated.
What Should You Do?
When to take action
- An occasional vomiting episode after which your baby acts completely normal
- Vomiting triggered by an obvious cause like car sickness, intense crying, or gagging on new food
- Spit-up or mild reflux in a baby under 6 months who is gaining weight normally
- A single episode that does not recur
- Your baby vomits after most feeds and is not gaining weight well
- Vomiting seems linked to specific foods suggesting intolerance or allergy
- Your baby frequently vomits hours after eating, which could indicate FPIES
- Recurring vomiting episodes without clear triggers
- Forceful projectile vomiting in a baby 2-8 weeks old after every feed, possibly indicating pyloric stenosis
- Vomit that is green or bile-stained, which may indicate bowel obstruction
- Your baby cannot keep any fluids down for 8+ hours and shows signs of dehydration
Sources
Related Resources
Related Digestive Concerns
Spit-Up vs. Vomit: How to Tell the Difference
Spit-up flows or dribbles out effortlessly, happens shortly after feeding, and baby seems unbothered. Vomiting is forceful, involves stomach muscle contractions, may happen anytime, and often leaves baby uncomfortable or upset. Most babies spit up frequently in the first year - it's messy but harmless as long as baby is gaining weight and seems comfortable.
Baby Reflux / GERD
Gastroesophageal reflux is very common in babies because the valve at the top of the stomach is still maturing. Most infant reflux is uncomplicated, meaning your baby spits up but is otherwise happy and growing well. True GERD, where reflux causes pain, feeding difficulties, or poor weight gain, affects a smaller number of babies and is very treatable.
Pyloric Stenosis in Babies
Pyloric stenosis is a condition where the muscle at the stomach outlet thickens, blocking food from entering the intestines. It causes forceful, projectile vomiting after feeds, usually starting between 2-8 weeks of age. Babies remain hungry and eager to eat despite vomiting. It requires surgical correction, which is safe and highly effective.
Formula Intolerance Signs
Some fussiness, gas, and occasional spit-up are normal for all babies, whether breastfed or formula-fed. True formula intolerance or allergy involves more persistent symptoms like excessive vomiting, bloody or mucousy stools, a widespread rash, or significant distress during and after feeds. If you suspect your baby is not tolerating their formula, talk to your pediatrician before making any changes, as they can help determine whether a switch is truly needed.
My Baby's Belly Looks Swollen
A rounded, slightly protruding belly is completely normal in babies and toddlers due to immature abdominal muscles and their proportionally larger organs. However, if the belly becomes suddenly swollen, feels hard and tight, or is accompanied by pain, vomiting, or changes in bowel movements, it needs medical evaluation as it could signal gas buildup, constipation, or rarely, something more serious.
My Baby Has an Anal Fissure (Blood When Pooping)
A small streak of bright red blood on the surface of your baby's stool or on the diaper is most commonly caused by an anal fissure, which is a tiny tear in the skin around the anus from passing hard stool. Anal fissures are very common in babies and toddlers and usually heal on their own with simple measures like keeping stools soft. While this is rarely serious, any blood in your baby's stool should be mentioned to your pediatrician.