Spit-Up or Reflux? When Is a Baby's Vomiting a Problem?

Spit-up is common in healthy babies and often comes from an immature valve between the esophagus and stomach. A baby who spits up but feeds well, stays content and gains weight is usually fine. Vomiting becomes a concern when it is forceful, green or bloody, comes with poor feeding, weight loss, dehydration or unusual sleepiness. This article explains spit-up versus reflux disease, warning signs, and when to call 911 or your pediatrician.

Spit-up or reflux: what is the difference?

Gastroesophageal reflux means stomach contents move back up into the esophagus. According to MedlinePlus, reflux in infants is common, and many babies spit up. The muscle at the bottom of the esophagus is still maturing, so milk can slip back up, especially after a big feed or when the baby is lying flat.

Clinicians often separate two situations. In "happy spitters," the baby spits up, but feeds well, grows and is comfortable. This is usually considered a normal part of infant digestion. The NASPGHAN/ESPGHAN pediatric reflux guideline describes gastroesophageal reflux disease (GERD) as reflux linked to troublesome symptoms or complications such as poor weight gain, feeding refusal, significant irritability with feeds, or breathing symptoms.

What normal baby spit-up looks like

Typical spit-up is an easy, effortless dribble or small flow of milk, often with a burp. It may look curdled because it has mixed with stomach acid. The baby is usually not bothered by it and may be ready to feed again soon.

• Comes up gently, without strain or distress
• Baby is feeding well and wetting diapers as usual
• Weight gain follows the pattern your pediatrician is tracking
• Baby is alert and calm between feeds

Many babies improve as they begin sitting up and spend more time upright, though the timing varies from child to child. Your pediatrician can tell you what to expect for your baby.

Spit-up versus vomiting

Spit-up is a small, easy flow. Vomiting is forceful and often involves the stomach muscles contracting. A baby who vomits a large part of a feed, or repeatedly, may be sick with something beyond ordinary reflux, such as a stomach infection or, less often, a blockage. Your pediatrician can help sort out which you are seeing.

Projectile vomiting, where milk shoots out with force, deserves a call to the pediatrician, especially if it happens after most feeds and the baby seems hungry again right afterward. One condition clinicians consider in that pattern is a narrowing at the stomach outlet (pyloric stenosis). It is much less common than ordinary reflux, and one episode of forceful vomiting does not establish it. Clinicians combine history, examination and sometimes imaging to decide.

Signs that reflux may be GERD

Reflux may be more than routine spit-up when it is linked to complications. Examples that a pediatrician may want to evaluate include:

• Poor weight gain or weight loss
• Refusing feeds, or arching and crying during or after feeding
• Frequent coughing, gagging or choking with feeds
• Recurrent wheezing or repeated chest infections
• Persistent irritability that does not settle with usual comforting

Fussiness alone has several possible explanations. If crying peaks in the evening in an otherwise well baby, see our article on colic in babies.

Vomiting that needs urgent attention

Some features of vomiting can point to a serious problem. Green (bright yellow-green) vomit may suggest bile, which can be a sign of an intestinal blockage in infants and needs emergency evaluation. Blood in the vomit, a swollen or hard belly, or a baby who is very sleepy, limp or hard to wake also need emergency care.

Other patterns also need emergency care. Vomiting with a bulging soft spot, a seizure, or repeated vomiting after a head injury needs emergency evaluation. These situations are uncommon compared with everyday causes of infant vomiting, but they can signal a serious problem such as raised pressure inside the skull. Sudden bouts of inconsolable crying with the legs drawn up, especially with red, jelly-like stool or a large amount of blood in the stool, can be a sign of an intestinal telescoping problem called intussusception. Vomiting with swelling of the lips, tongue or face, or hives, soon after a feed or a new food may be a severe allergic reaction (anaphylaxis), because it involves more than one body system. Repeated vomiting with paleness or floppiness after eating a food can also be urgent. Small streaks of blood in the stool of an otherwise well-appearing baby, with no hives or swelling, are worth a same-day call to the pediatrician.

Dehydration is another concern when vomiting is frequent, and it can worsen quickly in infants. Fewer wet diapers than usual or a dry mouth in a baby who is still alert are reasons for a same-day call. No wet diaper in 6 to 8 hours, a sunken soft spot on the head, no tears with unusual drowsiness or limpness, cold hands and feet, or being unable to keep down any fluids need emergency care. Our article on dehydration in children covers these in more detail.

Fever together with vomiting in a young infant needs attention because infections can progress quickly in the youngest babies. If a baby under 3 months old has a rectal temperature of 100.4°F (38°C) or higher, with or without vomiting, go to the emergency room now. Do not give fever medicine before talking with a clinician, because acetaminophen and ibuprofen are not appropriate for young infants unless a clinician says so, and a medicine can hide a fever that needs to be evaluated. Call 911 if the baby is also limp, blue or gray, breathing poorly or hard to wake. In an older infant, fever with repeated vomiting, or a fever that persists, calls for a same-day call to the pediatrician.

Other causes to keep in mind

Several conditions can look like reflux. A food allergy or intolerance, such as non-IgE-mediated cow's milk protein reactions, can cause vomiting, fussiness and feeding trouble. A PubMed Central review on non-IgE-mediated food allergy in infants discusses how these manifestations overlap with normal infant behaviors. See our article on food allergy signs in babies for more. Do not remove a food or change formula without talking to your pediatrician, since the right approach depends on the baby.

Less often, structural problems of the esophagus or stomach, or eosinophilic esophagitis (an allergic-type inflammation of the esophagus, described by MedlinePlus), can contribute to feeding trouble. These are much less common than ordinary reflux, and vomiting alone does not establish them.

What can help at home

For a healthy, thriving baby, simple steps may reduce spit-up. Not every step works for every baby, and results vary.

• Hold your baby upright for a period after feeds, and burp during and after feeding
• Offer smaller, more frequent feeds if your pediatrician agrees
• Check that the bottle nipple flow and your baby's latch are suitable; a lactation consultant or your pediatrician can help
• Avoid tight diapers or waistbands that press on the belly

Place your baby on their back on a firm, flat sleep surface for every sleep. Infant safe sleep guidance from pediatric and federal safety authorities advises against sleep positioners and propped-up sleeping surfaces to try to reduce reflux, because these can raise suffocation risk. Ask your pediatrician about safe sleep for a baby with reflux.

Medicines for infant reflux

Acid-reducing medicines are not recommended for healthy spitters. In babies with GERD they are used only under a pediatrician's direction, because they carry risks such as a higher chance of infections. Any medicine, including over-the-counter products and thickeners added to formula or milk, should be discussed with your pediatrician or pharmacist first, because risks and suitability depend on the baby's age and health. Follow the product label and your pediatrician's instructions. Do not change the dose or timing of a prescribed medicine on your own; ask the prescriber.

What to track before the visit

A short log can help your pediatrician. Note how often your baby spits up or vomits, how forceful it is, the color, how feeds are going, the number of wet diapers, and any coughing, wheezing or fever. Your baby's weight over time is among the most useful pieces of information. Tests such as imaging or a specialist referral are generally used only when growth, feeding or breathing problems suggest more than ordinary reflux.

When to Seek Medical Care