A one-month-old baby’s farting odor may be caused by a cold abdomen, indigestion, lactose intolerance and other reasons. 1. Abdominal cold: the digestive function of one-month-old babies is very imperfect, it is very easy to appear abdominal cold, abdominal cold is easy to appear fart odor. 2. indigestion: one-month-old babies because of the gastrointestinal tract function is relatively weak, if the baby at a time to eat more milk, can cause digestive disorders, indigestion of the situation, fart odor. 2. Lactose intolerance: If the intestinal colonies of one-month-old babies are imperfect, the lack of enzymes to break down lactose will make lactose incompletely decomposed in the body, resulting in smelly farts. There may be other reasons why a one-month-old baby’s fart stinks, so it is recommended that you go to the hospital in time to improve the examination and clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.