Newborns pass gas frequently, often 15 to 20 times a day or more, and almost all of it is completely normal. Their digestive systems are brand new and still learning to process milk, which means gas is one of the most common (and loudest) things you’ll notice in the first few months. If your baby is passing gas but still feeding well, gaining weight, and having regular bowel movements, the gassiness is almost certainly nothing to worry about.
Why Newborns Are So Gassy
A newborn’s gut is immature. The digestive tract has never processed food before birth, and the colonies of bacteria that help break down milk are still establishing themselves. That microbiome doesn’t fully resemble an adult’s until around age 3, but the most dramatic shifts happen in the first several months of life. During that early window, incomplete digestion of milk sugars produces extra gas as a byproduct.
Swallowed air is the other major source. Babies swallow air every time they cry, feed, or suck on a pacifier. Because they eat frequently (8 to 12 times a day in the newborn period), they accumulate a lot of air in their stomachs and intestines. A baby who gulps quickly during feeding, whether from a fast milk flow or an eager appetite, tends to swallow even more.
Breastfed vs. Formula-Fed Babies
Both breastfed and formula-fed babies deal with gas, but the triggers differ slightly. Breastfed babies may swallow extra air if they have a shallow latch on the breast or if the parent has a fast letdown reflex that forces the baby to gulp. Formula-fed babies can take in air around the nipple of the bottle, especially if the bottle isn’t angled to keep the nipple full of milk.
For breastfed babies, cow’s milk protein in the nursing parent’s diet is the most commonly reported food substance linked to gas and fussiness. Some infants have a temporary sensitivity to dairy proteins that pass through breast milk, though most begin tolerating them as they move out of early infancy. Cow’s milk protein and soy are the two most common allergens for infants. Other foods in the parent’s diet rarely cause problems, despite the long lists of “foods to avoid” that circulate online.
If your formula-fed baby seems unusually gassy or uncomfortable, it’s worth discussing the formula type with your pediatrician. Some babies do better with a partially broken-down (hydrolyzed) formula, particularly if a cow’s milk protein sensitivity is suspected.
What “Too Much” Gas Looks Like
Gas itself isn’t the concern. What matters is whether the gas is paired with signs of distress or other symptoms. A baby who passes gas all day but is otherwise content, feeding normally, and gaining weight is simply doing what newborns do.
Watch for these red flags that suggest something beyond normal gassiness:
- Forceful, projectile vomiting after feedings, especially with poor weight gain or fewer wet diapers
- Blood or mucus in the stool
- A swollen, hard belly that doesn’t soften after passing gas
- Fever, excessive sleepiness, or refusal to eat
- Sudden episodes of intense pain where the baby draws their legs to their chest, goes pale, and produces dark or bloody stools
- Back arching and crying during feeds paired with weight loss or poor weight gain
These symptoms can point to conditions like reflux, a milk protein allergy, or (rarely) more serious issues that need medical evaluation.
Gas vs. Colic
Parents often wonder whether their baby’s fussiness is “just gas” or colic. The standard diagnostic benchmark for colic is the “rule of three”: crying more than three hours per day, more than three days per week, for longer than three weeks. Colic typically starts around 2 to 3 weeks of age and peaks near 6 weeks.
Gassy episodes can certainly overlap with colic, and many colicky babies do seem to have more gas. But colic is defined by the pattern and duration of crying, not by how much gas a baby produces. A baby who is gassy but settles relatively quickly after passing gas or being burped probably doesn’t meet the threshold for colic.
Simple Ways to Reduce Gas
You can’t eliminate newborn gas entirely, but you can reduce how much air your baby swallows and help them pass what’s already there.
During feedings: Keep your baby as upright as possible while they eat. If you’re breastfeeding, hold your baby upright before switching breasts to give them a chance to burp. When bottle feeding, hold them upright for a few minutes after the feeding for the same reason. Anti-colic bottles with venting systems are designed to keep air separated from the milk so the baby swallows less of it during feeding. A slow-flow nipple can also help a baby who tends to gulp.
Between feedings: Lay your baby on their back and gently pedal their legs in a cycling motion. This helps move trapped gas through the intestines. Tummy time while your baby is awake also applies gentle pressure to the belly and encourages gas to pass. The more tummy time you build into the day, the better, and it has the added benefit of strengthening neck and shoulder muscles.
Do Gas Drops Work?
Over-the-counter gas drops containing simethicone are widely sold for infant fussiness. Simethicone works by breaking large gas bubbles into smaller ones, which are theoretically easier to pass. Many parents report that these drops help, but clinical research has not found simethicone to be very effective at relieving infant colic or significantly reducing gas-related crying, according to Mayo Clinic. The drops are generally considered safe, so trying them isn’t harmful, but they may not produce the dramatic improvement parents hope for.
When Gas Typically Improves
Most babies see a noticeable improvement in gassiness between 3 and 4 months of age. By that point, the digestive system has matured enough to handle milk more efficiently, and babies develop better coordination during feeding so they swallow less air. The gut’s bacterial community also becomes more diverse and stable over these early months, which supports smoother digestion. Some babies continue to be gassier than average well into their first year, particularly around the introduction of solid foods, but the discomfort and fussiness that accompany early gas usually fade significantly by the 4-month mark.