5 months of the baby does not poop smelly farts, caused by a number of reasons, such as indigestion, secondary megacolon, or milk powder allergies, etc., the cause of the different treatments are also different, can be general treatment, medication and so on. 1. indigestion: the baby gastrointestinal function is not yet well developed, digestive function is weak, when the baby intake is too much baby may have indigestion, which leads to baby constipation. The condition can be alleviated by reducing milk intake, using intestinal probiotics such as Bacillus subtilis bacillus to regulate intestinal flora, and giving the baby abdominal massage. 2. Secondary megacolon: prolonged use of antibiotics or diarrhea can lead to secondary megacolon. Treatment can be used, such as Keserol laxative, taking lactulose oral solution to soften the stool, as well as help the baby massage the stomach exhaust, promote gastrointestinal tract peristalsis, help defecation. 3. Milk powder allergy: when the baby after consuming milk powder or change milk powder brand after the appearance of not pooping and farting, you can suspect that the baby milk powder allergy, go to the hospital to check, change milk powder can be improved. 5 months of the baby does not defecate smelly farts, parents must pay attention to, take the baby to the hospital in time to check, identify the cause, symptomatic treatment, to avoid the deterioration of the child’s condition. The above drugs should be used under the guidance of a doctor.