Why does a newborn frequently pass gas while breastfeeding?

It is possible that newborns passing gas frequently while breastfeeding is caused by physiological factors, or it could be due to intestinal inflammation, indigestion, and other reasons.

1. Physiological Factors

During breastfeeding, if the mother frequently consumes large amounts of spicy or stimulating foods—such as chili peppers, garlic, or grilled items—the composition of her breast milk may change. This often leads to increased flatulence in the newborn after feeding.

2. Intestinal Inflammation

If a newborn suffers from conditions such as enteritis, it may cause an imbalance in the intestinal flora. A reduction in beneficial bacteria within the infant's gut, combined with fermentation of harmful bacteria and feces, typically produces foul-smelling gas, resulting in frequent passing of gas.

3. Indigestion

Newborns have immature physical development and relatively weak intestinal function. Improper feeding practices—such as overly frequent breastfeeding or excessive milk intake—can easily impair digestive function, leading to indigestion. This causes breast milk to accumulate in the intestines for prolonged periods, which commonly results in increased flatulence in breastfed newborns.