Infants’ smelly farts may be related to indigestion and gastrointestinal diseases. 1. Indigestion: infant digestive function is not well developed, gastrointestinal power is poor, such as mothers eat more fat, protein, so that infants are difficult to digest breast milk; or infants add complementary foods, eat more meat, eggs, milk, so that the fart is more smelly. 2. Gastrointestinal diseases: infants suffer from invasive bacterial or viral infections, causing intestinal flora imbalance, inflammation can make infants have smelly farts. There may be other reasons for infants to have smelly farts, if accompanied by other symptoms, such as fever, poor mental health, diarrhea, mucus, pus and blood stools, etc., it is recommended to immediately go to the hospital, improve the examination to clarify the cause of the disease, and then comply with the doctor’s instructions for targeted treatment or therapy.