Babies fart a lot because their digestive systems are brand new and still figuring out how to process air and food. Before birth, your baby spent nine months floating in fluid with no experience handling air at all. Once they start breathing, crying, and feeding, they swallow air constantly, and their immature gut produces gas as a natural byproduct of digestion. The good news: frequent gas in babies is almost always normal.
Why Baby Digestive Systems Produce So Much Gas
Two things happen simultaneously in a newborn’s gut that make gas nearly unavoidable. First, babies swallow air every time they cry, feed, or even just breathe through their mouth. Second, as breast milk or formula moves through the intestines, some of it goes undigested. The bacteria that naturally colonize your baby’s gut feed on that undigested material and produce gas as a byproduct. That gas has to go somewhere, so it comes out as a burp or a fart.
What makes this worse for babies compared to older kids or adults is that newborns simply aren’t good at moving gas through their system and pushing it out. They haven’t developed the core muscle coordination to do it efficiently, and the sensation itself is unfamiliar to them. This is why your baby might squirm, grunt, turn red, or cry while passing gas. It’s not necessarily pain. It’s discomfort from a process they haven’t mastered yet.
Swallowed Air During Feeding
The single biggest source of infant gas is swallowed air, and feeding is when most of that air gets in. A baby who cries from hunger before a feed is already gulping air. Then, when they latch on frantically, they swallow even more. This is true for both breastfed and bottle-fed babies, though the mechanics differ slightly.
With breastfeeding, a poor latch is the main culprit. If your baby can’t form a tight seal around the breast, air slips in with every suck. Conditions like tongue tie or lip tie can make this worse by preventing the baby from latching deeply enough. Signs of a poor latch include clicking sounds during feeding, your baby slipping off the breast frequently, and pain for you during nursing.
With bottle feeding, the flow rate of the nipple matters. A nipple that’s too fast causes gulping; one that’s too slow makes the baby suck harder and pull in more air around the seal. Holding the bottle at an angle so milk fills the entire nipple (rather than leaving an air pocket) helps reduce the amount of air your baby takes in. Paced bottle feeding, where you hold the baby more upright and pause periodically, can also make a noticeable difference.
Does Your Diet Affect a Breastfed Baby’s Gas?
If you’re breastfeeding, you’ve probably heard that eating broccoli, beans, or spicy food will make your baby gassy. The evidence for this is weak. There is limited scientific research proving that specific foods in a breastfeeding mother’s diet cause intestinal issues in babies, and spicy foods in particular have not been shown to cause discomfort in breastfed infants. Most babies tolerate whatever their mothers eat without any problems.
The one notable exception is cow’s milk protein. Foods containing cow’s milk protein are the most commonly reported dietary trigger for gas and fussiness in newborns. About 2.5% of children under 3 have a true cow’s milk protein allergy, which can cause symptoms like vomiting, diarrhea, and bloody stools. But even without a full allergy, some babies seem sensitive to cow’s milk protein that passes through breast milk. If you suspect this is an issue, keeping a food diary and watching for patterns over a week or two is more useful than eliminating random foods from your diet.
Simple Ways to Help Your Baby Pass Gas
Since most infant gas is just a matter of an immature system working things out, physical techniques that help move gas along are your best tools.
- Bicycle legs: Lay your baby flat on their back and gently move their legs in a pedaling motion. This acts like a gentle abdominal massage from the inside, helping trapped gas shift and escape.
- Tummy time: Supervised time on the belly puts gentle pressure on the abdomen, which encourages gas to move through. This has the added benefit of strengthening your baby’s neck and upper body.
- Frequent burping: Burp your baby during feeds, not just after. For bottle-fed babies, try pausing every ounce or two. For breastfed babies, burp when switching sides or whenever your baby naturally pulls off.
- Upright positioning after feeds: Holding your baby upright for 10 to 15 minutes after feeding lets gravity help air rise up and out as a burp rather than traveling through the intestines.
A warm bath can also relax the abdominal muscles enough to let gas pass more easily, and many parents find that a gentle clockwise belly massage (following the direction of the intestines) helps too.
Do Probiotics or Gas Drops Help?
Simethicone gas drops are widely available and considered safe for infants. They work by breaking large gas bubbles into smaller ones that are easier to pass. Some parents swear by them, though clinical evidence of their effectiveness is mixed.
Probiotics have a stronger evidence base, particularly for babies with colic (defined as crying for more than three hours a day, three or more days a week). One well-designed clinical trial found that breastfed infants given a specific probiotic strain daily for 21 days had their crying and fussing time drop to a median of 60 minutes per day, compared to 102 minutes in the placebo group. The probiotic group was also more than three times as likely to see a 50% reduction in crying. These results are promising, though probiotics seem to work better for breastfed babies than formula-fed ones, and you should discuss specific strains and dosing with your pediatrician.
When Gas Signals Something More
Frequent farting on its own, even if it’s loud or smelly, is normal. What changes the picture is when gas comes alongside other symptoms. Watch for blood or mucus in your baby’s stool, persistent vomiting (not just spit-up), a hard or visibly distended belly that doesn’t soften after passing gas, refusal to eat, poor weight gain, or a fever. These can point to issues like cow’s milk protein allergy, a feeding intolerance, or, rarely, a gastrointestinal problem that needs evaluation.
Also pay attention to the overall trend. Gassiness typically peaks around 4 to 6 weeks of age and gradually improves as your baby’s digestive system matures and they get better at feeding without swallowing as much air. If the gas is getting worse rather than better over time, or if your baby seems to be in genuine pain rather than just uncomfortable, that’s worth bringing up at your next visit.