Gas or Reflux? How to Tell What’s Really Keeping Your Baby Uncomfortable
It’s 3 a.m., your baby’s squirming, arching, and making that heartbreaking little grunt again. You’ve burped, rocked, and tried every “gas relief” trick on TikTok. But you can’t shake the question:
“Is this just gas… or could it be reflux?”
You’re not alone. Gas and reflux can look almost identical in newborns—and knowing which one you’re dealing with changes how you help your baby (and how soon you both get more sleep).
Let’s break it down the Baby Settler way: with clarity, compassion, and zero overcomplication.
First Things First: Why Babies Struggle with Digestion
In the early weeks, your baby’s digestive system is still maturing. The muscles that keep milk down (the lower esophageal sphincter) aren’t fully coordinated yet. Combine that with tiny tummies, lots of air intake, and lying flat most of the time—and you get a recipe for spit-ups, burps, and discomfort.
The key is figuring out which issue is causing your baby’s distress—gas or reflux—so you can respond the right way.
How to Tell If It’s Gas
Gas happens when swallowed air gets trapped in your baby’s belly. It’s common, normal, and fixable.
Typical signs of gas:
- Pulling knees toward the chest or arching during or after feeds
- Grunting or wriggling after swallowing air
- Short, restless sleep between feeds
- Relief after burping or passing gas
Common causes of gas:
- Fast letdown or bottle flow (baby can’t keep up)
- Crying before feeds (swallowing air)
- Shallow latch or leaking at the breast/bottle
- Overstimulation or overtiredness before feeds
What helps:
✨ Burp mid-feed and again at the end. Don’t wait until they finish the whole bottle or breast.
✨ Check bottle flow. Most babies need slower flow than you think. (At Baby Settler, we typically recommend Dr. Brown’s Preemie or Level T early on.)
✨ Feed on cue. Hungry, crying babies gulp air—so catch hunger cues early.
✨ Hold baby upright 10–15 minutes after feeding. Gravity helps bubbles move through.
If your baby calms quickly once gas is released, it’s probably just that—gas.
How to Tell If It’s Reflux
Reflux, on the other hand, happens when stomach contents travel back up the esophagus. Some reflux is normal (that’s why most babies spit up occasionally). It becomes an issue when it causes pain or feeding difficulties.
Possible reflux clues:
- Frequent spit-ups that seem painful (crying or arching right after)
- Pulling off the breast or bottle mid-feed and refusing to go back
- Coughing, gagging, or hiccupping often after feeds
- Poor weight gain despite frequent feeding
- Short, fussy feeding sessions followed by back-arching
What helps:
✨ Feed smaller amounts more frequently so the stomach isn’t too full.
✨ Keep baby upright for at least 15–20 minutes after every feed.
✨ Avoid tight swaddles immediately after feeding.
✨ Check latch and flow rate. Fast flow bottles or strong letdown can worsen reflux by overwhelming the stomach.
✨ If symptoms persist, talk to your pediatrician—they may recommend evaluation or medical management if baby’s in pain or not gaining.
When It’s Both (Yes, That Happens!)
Some babies experience both gas and reflux.
They swallow air (causing gas), then the trapped air increases pressure in the stomach (causing reflux).
The good news? You can usually ease both by focusing on one thing first: efficient feeding.
That’s the foundation of the Baby Settler Method.
When babies feed calmly, comfortably, and completely, their digestion naturally regulates—and everyone sleeps better.
What You Can Do Tonight
If you suspect gas or reflux, try this tonight:
Start with a calm feed. Feed before crying starts to reduce swallowed air.
Pause halfway. Burp and reposition baby.
Keep upright for 15 minutes post-feed (walk, rock, or just hold).
Lay baby flat only once settled—not immediately after feeding.
Track patterns. Note when symptoms happen and after which feeds.
Within a few days, you’ll start seeing trends that point clearly to gas or reflux—and you’ll feel more confident responding.
When to Seek Extra Support
If your baby:
- Is losing weight or not gaining as expected
- Has projectile spit-up or green/yellow vomit
- Cries in pain after most feeds
- Refuses to feed or arches with every attempt
…it’s time to get professional eyes on the situation.
Our team of 1:1 consultants can help you troubleshoot latch, flow rate, and feeding mechanics virtually or in person. Many times, the fix is simple—and it changes everything.
The Bottom Line: Start with Feeding
Gas and reflux are often feeding problems in disguise.
When you address feeding efficiency first, digestion, comfort, and sleep follow.
If you’re ready to stop guessing and start understanding your baby’s cues, here’s where to begin:
Babies Made Simple (book) — your bedside guide to feeding and sleep rhythms that make sense.
Babies Made Simple On-Demand Course + PDF Guide — everything I teach 1:1, available instantly for your next late-night question.
1:1 Consultations — personalized feeding and sleep support from me and my team.
Because when feeding makes sense, sleep finally does too. 💛
About Hillary Sadler, RN, MSN, IBCLC
Hillary Sadler is a labor & delivery nurse, lactation consultant, and mom of four. She’s the founder of Baby Settler and author of Babies Made Simple. Through her book, course, and consults, Hillary helps families simplify feeding and sleep so everyone can thrive.
