Newborn farting odor may be caused by the mother’s improper diet, improper feeding, cold and other reasons. 1. Improper diet of the mother: if the newborn is breastfed, the mother’s diet may also have a certain degree of influence on the newborn, if the mother is a large number of high-protein, high-fat food, may lead to the newborn’s intestinal accumulation of excessive gas, farting and smelly situation. 2. Improper feeding: the intestinal function of newborns is not yet well developed and the intestinal function is weak, if parents feed their newborns too much milk and improperly brewed milk powder, it may cause the newborns to bloat, spit up milk, and increase the number of stools, which will result in farting and stinking. 3. Cold: If the newborn is cold, it may cause gastrointestinal disorders, diarrhea, abdominal pain and other symptoms, so it may cause fart odor. It is recommended that parents should closely observe the development of their newborns and go to the hospital if there are other adverse reactions.