Why Babies Spit Up: What's Normal and When to Call Your Pediatrician Why Babies Spit Up: What's Normal and When to Call Your Pediatrician

Why Babies Spit Up: What's Normal and When to Call Your Pediatrician

Marie Udell, Pediatric Nurse Practitioner

This blog was written in paid partnership with Dr. Brown's

Many babies spit up after feeding and most of the time, it's completely normal. When a baby spits up, it can look like they just threw up their entire bottle. But the reality is that it's likely only a teaspoon or tablespoon.

Newborns have a very short, immature esophagus and an underdeveloped lower esophageal sphincter — the muscle that keeps stomach contents from coming back up. When you combine this with a liquid-only diet and a lot of time lying flat on their backs, it creates the perfect setup for reflux. Luckily, this is developmental and typically temporary.

As your baby grows, their digestive anatomy matures. Most babies naturally outgrow spit-up, with noticeable improvement between 6-12 months of age, especially when they are able to sit more upright and begin eating solid foods.

Bottle-Fed vs. Breastfed Spit-Up

Spit-up can happen with both bottle-fed and breastfed babies, but for slightly different reasons:

  • Bottle-fed babies may spit up due to overfeeding or drinking too quickly. Spitting up does not mean that your baby is not tolerating the formula and actually, frequently switching formulas in attempts to "fix" this issue can worsen symptoms. Always contact your pediatrician before switching formulas.
  • Breastfed babies may spit up due to a fast let-down reflex, causing them to take in a large volume of milk in a short amount of time. If the baby starts choking or coughing during feeding, you may have a fast let-down. To help prevent this situation, try a laid back nursing position to slow the flow of milk.

Paced feeding and using a slower nipple flow rate can also be extremely helpful in reducing spit-up and improving comfort for bottle-fed babies. For more details, check out my other blog post on paced feeding!

"Happy Spitters"

Many infants fall into the category of what we call "happy spitters." These are babies who spit up but are otherwise doing great.

Happy spitters:

  • Are content and comfortable
  • Feed well
  • Sleep normally
  • Gain weight appropriately
  • Have plenty of wet diapers (at least six in a 24-hour period)

In these cases, spit-up usually bothers parents more than the baby, and no treatment is needed.

Signs of True Reflux or Feeding Problems

While spit-up is common, certain signs should never be ignored. Call your pediatrician if your baby has:

  • Forceful or projectile vomiting
  • Green (bilious) or bloody spit-up
  • Poor weight gain
  • Decreased urine output
  • Feeding refusal or signs of feeding aversion

These symptoms may indicate reflux that needs medical evaluation or another underlying issue.

Tips to Help Reduce Spit-Up

If your baby is spitting up (whether a happy spitter or experiencing true reflux), these simple strategies may help:

  • Hold your baby upright for 15 minutes after feeding.
  • Burp your baby every 1-2 ounces during bottle feeding.
  • Talk to your pediatrician if you have concerns as some babies may benefit from medication.

Never elevate the head of the bassinet or crib. This was a common recommendation previously and is no longer recommended as it's dangerous and does not reduce reflux risk. Putting your baby on their backs to sleep is still the safest position for sleep, even for babies with reflux.

Spit-up is incredibly common in infancy and typically improves with time as your baby's digestive system matures. Medications are rarely needed, as reflux is most often managed successfully with conservative measures like those discussed above. Treatment is generally only considered if reflux begins to affect growth, feeding, or overall well-being. Rather than solely looking at the frequency of spit ups, considering overall weight gain, diaper outputs, and general comfort level helps determine if additional intervention is needed.

Spit-up is messy and can be emotionally exhausting for parents. Many parents worry they're doing something wrong or missing a problem. It's important to know that reflux does not mean you're failing as a parent. It's far more common than most people realize. My own daughter struggled with reflux until about 10 months of age, so I truly understand the endless laundry, outfit changes, and second-guessing. I vividly remember one moment when she spit up what looked like so much milk. Out of curiosity (and desperation), I scooped it up — and it turned out to be only 5 mL. It was a powerful reminder of how deceiving spit-up can look.

If your baby is happy, growing, and well-hydrated, spit-up alone is rarely a cause for concern. However, if something doesn't feel right, or if symptoms change, trust your instincts and reach out to your pediatrician.

About the Author

Marie is a Pediatric Nurse Practitioner, mom of three, and the founder of Loving Littles LLC, a text-based support service designed to guide parents through the joys and challenges of their child’s early years. Currently pursuing her IBCLC certification, Marie is passionate about empowering parents with evidence-based knowledge, practical tips, and reassurance so they can confidently care for their babies. Through her work, she combines her clinical expertise with her personal experience as a parent to create a supportive, accessible resource for families navigating the first stages of childhood.

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