Is My Baby's Spit-Up Normal or Is It Reflux?

Baby spit-up is often a normal part of infancy, especially when the baby is feeding well, gaining weight and seems comfortable. Reflux becomes a concern when spit-up comes with poor weight gain, feeding refusal, arching with distress, or breathing trouble. Some signs, such as green or bloody vomit, forceful vomiting, or a swollen belly, need urgent care. This article explains how to tell the difference and what to say to your pediatrician.

Is baby spit-up normal? What it usually looks like

Spit-up is milk or formula that flows back out of the mouth, often with a burp. In many healthy babies it happens now and then, looks like a small amount compared with what the baby just drank, and does not seem to bother them. Clinicians sometimes call this "happy spitter" reflux, and it often resolves on its own as the baby grows. Babies who spit up this way often feed eagerly, have regular wet diapers and keep growing along their own curve.

Several factors can contribute. A baby's lower esophageal sphincter, the muscle valve between the esophagus and stomach, is still maturing. Babies also spend much of the day lying down, eat mostly liquid, and have a small stomach. The exact mix of reasons is not fully understood, and it varies from baby to baby.

Spit-up versus vomiting

Spit-up tends to dribble or pour out gently. Vomiting is more forceful, with the belly muscles tightening and the milk coming out with more power, sometimes a distance from the baby. Occasional vomiting can come with a stomach virus, but repeated forceful vomiting needs a clinician's attention, especially in a young infant. If your main question is when a baby's vomiting becomes a problem, the related article "Spit-Up or Reflux? When Is a Baby's Vomiting a Problem?" goes into that in detail.

What reflux disease means in a baby

Gastroesophageal reflux (GER) is the movement of stomach contents back up the esophagus. It is common in infants and often needs no treatment. Gastroesophageal reflux disease (GERD) is the term used when reflux causes troublesome symptoms or complications. MedlinePlus (NIH) describes reflux in children as the backward flow of stomach contents, and notes that GERD is the more persistent form that can cause symptoms such as poor feeding or poor weight gain.

Clinicians usually combine your description of feeding and symptoms, a physical exam, and the baby's growth chart. Testing is not needed for every baby, and no single simple test settles the question in every case. For example, a PubMed Central (NIH) study of salivary pepsin found that this saliva test lacked sensitivity as a diagnostic tool for extraesophageal reflux.

Signs that spit-up may be more than normal

Tell your pediatrician about any of these so they can decide whether an evaluation is appropriate:

• Weight loss, poor weight gain, or falling off the growth curve.
• Refusing feeds, or pulling off the breast or bottle in apparent pain.
• Frequent arching of the back, crying or irritability during or after feeds that is hard to settle.
• Frequent coughing, choking, gagging or wheezing around feeds.
• Fewer wet diapers than usual.
• Spit-up that continues or worsens as the baby gets older. Many infants outgrow spit-up in their first year or so, though timing varies.

Some babies with these symptoms have reflux disease. Others have a feeding problem, a food allergy such as cow's milk protein allergy, or a structural issue in the digestive tract, which a pediatrician can evaluate. A clinician sorts these out with the history and exam, which is why a visit is more useful than guessing at home.

Signs that need urgent attention

A few features suggest something other than ordinary reflux and can progress quickly. They are listed in the emergency box below and explained here.

• Green or yellow-green (bilious) vomit. This can be a sign of a blockage in the intestines, which can be a surgical emergency, so go to the emergency room right away.
• Blood in the vomit, or vomit that looks like coffee grounds. This can suggest bleeding in the digestive tract.
• Forceful, repeated vomiting in a young baby who stays hungry. Pyloric stenosis, a narrowing at the stomach outlet, is one possible cause and needs prompt evaluation. Call your pediatrician right away, and go to urgent or emergency care if you cannot reach them the same day.
• A swollen, firm or tender belly. This can accompany an obstruction and needs emergency evaluation in an infant, even without repeated vomiting.
• Episodes of severe, intermittent crying with drawing up of the legs, pallor, or bloody, jelly-like stool. These can be features of intussusception, where one part of the bowel telescopes into another, and they need emergency care.
• Fever in a baby under 3 months old. A rectal temperature of 100.4°F (38°C) or higher in a baby this young, especially with vomiting, needs emergency evaluation, because young infants can become seriously ill from infection.
• Trouble breathing, blue or gray color, or limpness. A baby who has choked on milk or is struggling to breathe needs emergency help.

For other breathing concerns, see the companion article "When to Worry About a Baby's Breathing."

Dehydration: the quiet risk

Babies can lose fluid quickly when they vomit often. Milder signs that may suggest dehydration include noticeably fewer wet diapers, a dry mouth, and no tears when crying. A baby with these signs and ongoing vomiting should be seen by a clinician promptly, today, and sooner if the baby is under 3 months old or getting worse. Signs of more severe dehydration are a sunken or bulging soft spot on the head, very sunken eyes, no wet diaper for many hours, cold or mottled hands and feet, and unusual sleepiness or limpness. A baby with any of these, especially with vomiting, needs emergency care. If the baby is very hard to wake, call 911.

Practical steps that may help at home

Many families find small changes can reduce how much a baby spits up. Evidence for each varies, and the pediatrician can tell you which suit your baby.

• Burp during and after feeds. Pausing partway through a feed to burp may help release swallowed air.
• Try smaller, more frequent feeds. An overfull stomach may spill over more easily. Do not cut back feeds without guidance if the baby seems hungry or is not gaining well.
• Keep the baby upright for a while after eating. Holding the baby upright for a short time after feeds is a common suggestion.
• Check bottle flow. A nipple that flows too fast or too slowly can lead to gulping or air swallowing.
• Avoid pressure on the belly. Tight diapers and waistbands, and vigorous play right after a feed, may increase spit-up.

Safe sleep still comes first

Standard safe-sleep advice for healthy babies is to place them on their backs on a firm, flat sleep surface. Do not raise the head of the crib, use wedges or positioners, or put a baby to sleep in a sloped product because of reflux unless your pediatrician has specifically advised something different. These products have been linked with safety concerns. Talk to your pediatrician before changing how your baby sleeps.

Medicines and thickened feeds

Acid-suppressing medicines are generally not recommended for healthy infants with ordinary spit-up or fussiness alone. A pediatrician may consider them for an infant with a diagnosed reflux disease and troublesome symptoms. They carry their own risks and label cautions, including a possible higher risk of some infections. Do not give acid-reducing medicines or add thickeners, rice cereal or other products to bottles unless your pediatrician advises it. Xanthan-gum thickeners should not be given to premature infants because of a risk of a serious bowel condition called necrotizing enterocolitis, so ask your pediatrician before using any thickener. Follow the product label and the prescriber's directions, and ask the pediatrician or pharmacist before giving any reflux medicine, over-the-counter product or home remedy. If you ever think a baby swallowed something harmful, call Poison Control at 1-800-222-1222.

When reflux continues past infancy

Most spit-up fades as the digestive system matures and the baby starts spending more time upright. Reflux symptoms that persist into later childhood, such as frequent heartburn, trouble swallowing, or repeated vomiting, deserve a conversation with a clinician. Conditions such as a hiatal hernia, in which part of the stomach pushes up through the diaphragm, can sometimes play a role; MedlinePlus (NIH) explains hiatal hernia.

What to track before the appointment

A short log can help your pediatrician. Note how often your baby spits up, how much it seems to be, how it relates to feeds, the color, any coughing or breathing changes, wet diaper counts, and the baby's mood. Photos or a short video of a typical episode can help. Bring the product names of any formula, thickener or medicine you have used.

Reflux is a symptom with many possible causes, and a single feature rarely establishes a diagnosis on its own. Trust your sense of your own baby: if something seems off, it is reasonable to call.

When to Seek Medical Care