The human microbiota consists of trillions of bacteria that live in the oral cavity, respiratory tract, skin and gastrointestinal tract, and most of them are located in the intestine.1 There is a body of research that have studied the gut microbiota extensively and have shown that it plays a crucial role in human health by modulating the immune system, controlling metabolism and brain function. Dysbiosis, an imbalance in the gut microbiota early in life, has been found to be associated with the occurrence of various diseases later in life.2 Several studies have been conducted over the last decade to determine the link between the microbiota and allergic diseases in children. The results suggest that altering the gut microbiota plays an important role in promoting these allergic diseases.