Hello, This is pretty unusual for stool to have such smell, but it may be possible in some infectious diarrheas. Diarrhea is in most cases is the dietary or infectious ones. If this is caused by diet then he should try to rest more and switch to a diet of clear liquids. Drink water, juice, bouillon, and weak tea to avoid becoming dehydrated. Replace lost fluids and electrolytes with sports drinks. Avoid coffee or soft drinks that contain caffeine, since caffeine increases the loss of water and salt. If you have nausea in addition to diarrhea, take very small sips of fluid frequently and suck on ice chips. You should also consider over-the-counter medications such as Bismuth Subsalicylate (Pepto-Bismol) or Loperamide (Imodium).In cases of infectious diarrheas, you should do microbiologist testing of stool and see the exact microbe and then antibiotics can be used additionally. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Ivan R. Rommstein