Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com. Why do farts smell so bad? – Daisy, age 7, New York, New York A healthy person farts about 14 to 20 times each day. All together, that’s enough gas to fill a super stinky party balloon. Farts are made of gases that are produced by trillions of tiny organisms called microbes, mostly bacteria, that live in your gut.