Your baby is gassy because their digestive system is brand new and still learning how to process food and move air through efficiently. Nearly all newborns deal with gas, and it typically peaks in the first few months before improving around 4 to 6 months of age. The good news: most infant gas is completely normal, and there are straightforward ways to reduce it.
How Babies End Up With So Much Gas
Gas enters your baby’s digestive tract in two main ways: they swallow air, or their gut produces gas while breaking down milk. Both are happening constantly in the early months.
Air swallowing is the bigger culprit than most parents realize. Babies gulp air when they cry, when they babble, when they feed in certain positions, and when they don’t have a tight seal around a breast or bottle nipple. A loose latch during breastfeeding lets air slip in alongside the milk. With bottles, a nipple flow that’s too fast forces the baby to gulp, pulling extra air into their stomach. Even a perfectly fed baby still swallows some air throughout the day.
The other factor is digestive immaturity. Your baby’s gut is processing milk for the first time, and the muscles that move food through the intestines are still developing coordination. Gas that an older child or adult would pass without noticing can get temporarily trapped in an infant’s smaller, less efficient digestive tract. This is why your baby might squirm, pull their legs up, or seem uncomfortable even when nothing is actually wrong with them.
Breastfeeding, Formula, and Food Sensitivities
If you’re breastfeeding, you’ve probably heard that eating broccoli, beans, or spicy food will make your baby gassy. The evidence doesn’t support this. There are no specific foods in a breastfeeding parent’s diet that have been proven to cause gas in infants, and spicy foods in particular have not been shown to cause discomfort in breastfed babies. Many parents report that foods like kale, onions, garlic, or peppers seem to bother their baby, but just as many babies tolerate those foods without any issue.
The one consistent exception is cow’s milk protein. Foods containing cow’s milk protein are the most commonly reported substance linked to gas and fussiness in newborns. A true cow’s milk protein sensitivity can cause intestinal inflammation, and symptoms are usually delayed, showing up hours after a feeding rather than immediately. If your baby has persistent gas along with mucus or blood in their stool, excessive spitting up, or skin rashes, a cow’s milk sensitivity is worth discussing with your pediatrician.
For formula-fed babies, the protein source matters. Casein, a protein in cow’s milk, is a common trigger for allergy symptoms. Some babies who react to cow’s milk formula also react to soy. Research shows that infants with certain gut sensitivities to cow’s milk have a 25 to 60% chance of also reacting to soy formulas, so switching to soy isn’t always the fix parents hope for. Specialized formulas with broken-down proteins exist for babies with confirmed sensitivities.
Practical Ways to Reduce Gas
The most effective strategies target air swallowing and help your baby move gas through more quickly.
- Burp during and after feedings. Don’t wait until the end of a feeding session. Pause halfway through a bottle or when switching breasts to burp. This prevents a large air bubble from building up in the stomach.
- Check the latch or nipple flow. A good seal around the breast or bottle nipple is the single best way to reduce air intake. If you hear clicking or gulping sounds during feeding, your baby is likely breaking the seal and swallowing air. For bottles, make sure the nipple flow matches your baby’s age. Too fast and they gulp; too slow and they suck harder and pull in air around the edges.
- Bicycle their legs. Lay your baby flat on their back and gently move their legs in a pedaling motion. This acts as a simple massage that helps trapped gas move through the intestines.
- Use tummy time strategically. Supervised tummy time puts gentle pressure on the abdomen, which can help push gas out. It doubles as strengthening exercise for their head and upper body.
Feeding position also plays a role. Keeping your baby’s head elevated above their stomach during feeds lets air rise to the top of the stomach where it’s easier to burp out. If you’re bottle feeding, tilting the bottle so the nipple stays full of milk (rather than half air) reduces how much air your baby takes in with each swallow.
What About Gas Drops and Probiotics
Simethicone drops (sold under brands like Mylicon or Little Remedies) are the go-to over-the-counter option many parents try first. But the clinical evidence is not encouraging. A systematic review of multiple studies found that simethicone showed no benefit for reducing gas or crying, and some reviews actually noted a worsening of symptoms. Several major pediatric guidelines specifically recommend against using simethicone based on the current evidence.
Probiotics tell a different story, at least for breastfed babies. High-quality evidence shows that one specific probiotic strain, Lactobacillus reuteri, reduced crying time by 25 to 65 minutes over 24 hours in breastfed infants. That’s a meaningful difference during the fussiest weeks. The catch is that this evidence applies mainly to breastfed babies. The data for formula-fed infants is much thinner, and results have been mixed. If you want to try a probiotic, look for one containing L. reuteri and talk to your pediatrician about which product is appropriate for your baby’s age.
Normal Gas vs. Something More
Most infant gas is a nuisance, not a medical problem. Your baby will strain, grunt, turn red, pull up their knees, and pass gas loudly. This looks alarming but is usually just a baby figuring out how to coordinate the muscles involved in digestion. It resolves on its own as their system matures, typically by 4 months, though some babies take until 6 months to fully settle.
The pattern worth watching for is colic, which is defined by the “rule of three”: crying more than three hours per day, more than three days per week, for longer than three weeks. Colic involves the same gas and fussiness but at an intensity and duration that goes beyond typical newborn discomfort. It still resolves on its own by 4 to 6 months in most cases.
Gas accompanied by other symptoms tells a different story. Constipation can cause gas that smells noticeably foul. A stomach virus can cause gas alongside vomiting and diarrhea. And for older babies starting solids, new foods are a common and temporary source of extra gas as the gut adjusts to digesting something other than milk. If your baby has bloody or mucusy stools, is refusing to eat, isn’t gaining weight, or seems to be in genuine pain rather than general fussiness, those are signs that something beyond normal digestive immaturity may be going on.