Baby’s smelly farts without poop may be caused by improper diet, acute gastroenteritis or lack of exercise. 1. Improper diet: If the baby consumes too much protein and sugar, it may be due to the baby’s poor digestive function, the food consumed stays in the intestinal tract for a long time and produces more gas, resulting in smelly farts without poop. 2. Acute gastroenteritis: If the baby suffers from gastrointestinal viral and bacterial infections, causing acute gastroenteritis, the symptoms may be manifested as farting but not pooping. 3. lack of exercise: if the baby intake is too much, lack of exercise, there will be only farting and not pooping, can be appropriate to participate in outdoor exercise, to promote gastrointestinal tract peristalsis. If your baby farts but does not poop, it is recommended to closely observe the stool condition and seek medical attention if there is any abnormality.