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Children, those who spend time in school or day care may be exposed to infections that cause foul-smelling gas. Children who have diseases that cause malabsorption of nutrients from the intestine are very likely to have foul-smelling flatulence.
Inherited diseases such as cystic fibrosis cause poor absorption of nutrients through the intestine. Stools become more bulky as well as greasy and foul smelling. Foul-smelling flatulence will also occur.
Other malabsorption diseases such as celiac diseases have similar symptoms.
Other common causes of foul-smelling gas and stools in children include giardia, a protozoan infection often present in unclean water that's passed through the fecal-oral route, and rotavirus, a virus that produces copious amounts of foul-smelling diarrhea.
Children who have a bacterial infection in the intestine may produce foul-smelling gas, because bacteria in the intestine release sulfur-containing gases that can cause foul-smelling flatulence.
Eating foods that produce excess gas, like beans and cabbage, also causes foul-smelling gas.
Treatment depends on the cause. If certain foods cause a problem, dietary changes can reduce foul-smelling gas.
Children with malabsorptive diseases such as cystic fibrosis and celiac disease require specialized treatment and diets to help them absorb more nutrients.
Bacterial and viral infections in the intestine may require antibiotics or other medications to destroy the harmful intruder. Children with allergies may require dietary changes
Even though it is embarrassing, i advice you see child specialist for examination and to find the exact cause, you can also go for stool routine test can get some information about the symptom.
Hope I have provided the information you needed.
Wish you good health. Take care.

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