Smelly poop can be caused by physiological phenomenon, dietary factors, intestinal infections, gastrointestinal dysfunction and other reasons. 1. Physiological phenomenon: after the food is ingested into the body, it needs to be fermented by bacteria and then discharged from the body, which can lead to smelly poop in children. 2. Dietary structure factors: If the proportion of dietary structure is not appropriate, such as excessive intake of milk and other protein-rich foods, etc., a large amount of ammonia and sulfur-containing compounds can be produced in the digestive process, which can cause the phenomenon of smelly poop. 3. Intestinal infections: such as acute enteritis, if bacteria or viruses and other pathogens infect the intestinal tract, can cause abnormal fermentation of food, resulting in smelly poop. 4. Gastrointestinal dysfunction: patients usually show indigestion, which can cause food to remain in the intestinal memory for too long, and after a long time of fermentation, making the stool more smelly. If your child’s poop is smelly, parents are advised to take your child to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.